{"trustable":false,"prependHtml":"\u003cstyle type\u003d\u0027text/css\u0027\u003e\n .input, .output {\n border: 1px solid #888888;\n }\n .output {\n margin-bottom: 1em;\n position: relative;\n top: -1px;\n }\n .output pre, .input pre {\n background-color: #EFEFEF;\n line-height: 1.25em;\n margin: 0;\n padding: 0.25em;\n }\n \u003c/style\u003e\n \u003clink rel\u003d\"stylesheet\" href\u003d\"//codeforces.org/s/96598/css/problem-statement.css\" type\u003d\"text/css\" /\u003e\u003cscript\u003e window.katexOptions \u003d { disable: true }; \u003c/script\u003e\n\u003cscript type\u003d\"text/x-mathjax-config\"\u003e\n MathJax.Hub.Config({\n tex2jax: {\n inlineMath: [[\u0027$$$\u0027,\u0027$$$\u0027], [\u0027$\u0027,\u0027$\u0027]],\n displayMath: [[\u0027$$$$$$\u0027,\u0027$$$$$$\u0027], [\u0027$$\u0027,\u0027$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript type\u003d\"text/javascript\" async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS_HTML-full\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cp\u003e\n考虑整数的十进制表示。 如果数字 d 出现在偶数位置的数字的十进制表示中,而没有其他地方,那么我们将数字称为 d-magic。\n\u003cbr\u003e\n例如,数字 1727374, 17, 1 是 7-magic 但 77, 7, 123, 34, 71 不是 7-magic。 另一方面,数字 7 是 0-magic,123 是 2-magic,34 是 4-magic,而 71 是 1-magic。\n\u003cbr\u003e\n找出段 [a, b] 中是 m 倍数的 d-幻数的数目。 因为答案可能非常大,所以你应该只找到它的值模 109 + 7(所以你应该找到除以 109 + 7 后的余数)。"}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003eThe first line contains two integers \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003em\u003c/i\u003e, \u003ci\u003ed\u003c/i\u003e\u003c/span\u003e (\u003cspan class\u003d\"tex-span\"\u003e1 ≤ \u003ci\u003em\u003c/i\u003e ≤ 2000\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e0 ≤ \u003ci\u003ed\u003c/i\u003e ≤ 9\u003c/span\u003e) — the parameters from the problem statement.\u003c/p\u003e\n\u003cp\u003eThe second line contains positive integer \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003ea\u003c/i\u003e\u003c/span\u003e in decimal presentation (without leading zeroes).\u003c/p\u003e\n\u003cp\u003eThe third line contains positive integer \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003eb\u003c/i\u003e\u003c/span\u003e in decimal presentation (without leading zeroes).\u003c/p\u003e\n\u003cp\u003eIt is guaranteed that \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003ea\u003c/i\u003e ≤ \u003ci\u003eb\u003c/i\u003e\u003c/span\u003e, the number of digits in \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003ea\u003c/i\u003e\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003eb\u003c/i\u003e\u003c/span\u003e are the same and don\u0027t exceed \u003cspan class\u003d\"tex-span\"\u003e2000\u003c/span\u003e.\u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003ePrint the only integer \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003ea\u003c/i\u003e\u003c/span\u003e — the remainder after dividing by \u003cspan class\u003d\"tex-span\"\u003e10\u003csup class\u003d\"upper-index\"\u003e9\u003c/sup\u003e + 7\u003c/span\u003e of the number of \u003cspan class\u003d\"tex-font-style-tt\"\u003ed-magic\u003c/span\u003e numbers in segment \u003cspan class\u003d\"tex-span\"\u003e[\u003ci\u003ea\u003c/i\u003e, \u003ci\u003eb\u003c/i\u003e]\u003c/span\u003e that are multiple of \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003em\u003c/i\u003e\u003c/span\u003e.\u003c/p\u003e"}},{"title":"Examples","value":{"format":"HTML","content":"\u003cdiv class\u003d\"sample-test\"\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Input\n \u003c/div\u003e\n \u003cpre\u003e2 6\u003cbr\u003e10\u003cbr\u003e99\u003cbr\u003e\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Output\n \u003c/div\u003e\n \u003cpre\u003e8\u003cbr\u003e\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Input\n \u003c/div\u003e\n \u003cpre\u003e2 0\u003cbr\u003e1\u003cbr\u003e9\u003cbr\u003e\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Output\n \u003c/div\u003e\n \u003cpre\u003e4\u003cbr\u003e\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Input\n \u003c/div\u003e\n \u003cpre\u003e19 7\u003cbr\u003e1000\u003cbr\u003e9999\u003cbr\u003e\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Output\n \u003c/div\u003e\n \u003cpre\u003e6\u003cbr\u003e\u003c/pre\u003e\n \u003c/div\u003e\n\u003c/div\u003e"}},{"title":"Note","value":{"format":"HTML","content":"\u003cp\u003eThe numbers from the answer of the first example are \u003cspan class\u003d\"tex-span\"\u003e16\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e26\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e36\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e46\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e56\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e76\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e86\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e96\u003c/span\u003e.\u003c/p\u003e\n\u003cp\u003eThe numbers from the answer of the second example are \u003cspan class\u003d\"tex-span\"\u003e2\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e4\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e6\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e8\u003c/span\u003e.\u003c/p\u003e\n\u003cp\u003eThe numbers from the answer of the third example are \u003cspan class\u003d\"tex-span\"\u003e1767\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e2717\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e5757\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e6707\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e8797\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e9747\u003c/span\u003e.\u003c/p\u003e"}}]}