{"trustable":true,"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$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript type\u003d\"text/javascript\" async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS_HTML-full\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cp\u003eYou are given a sequence of integers of length $$$n$$$ and integer number $$$k$$$. You should print \u003cspan class\u003d\"tex-font-style-bf\"\u003eany integer\u003c/span\u003e number $$$x$$$ in the range of $$$[1; 10^9]$$$ (i.e. $$$1 \\le x \\le 10^9$$$) such that exactly $$$k$$$ elements of given sequence are less than or equal to $$$x$$$.\u003c/p\u003e\u003cp\u003eNote that the sequence can contain equal elements.\u003c/p\u003e\u003cp\u003eIf there is no such $$$x$$$, print \"\u003cspan class\u003d\"tex-font-style-tt\"\u003e-1\u003c/span\u003e\" (without quotes).\u003c/p\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003eThe first line of the input contains integer numbers $$$n$$$ and $$$k$$$ ($$$1 \\le n \\le 2 \\cdot 10^5$$$, $$$0 \\le k \\le n$$$). The second line of the input contains $$$n$$$ integer numbers $$$a_1, a_2, \\dots, a_n$$$ ($$$1 \\le a_i \\le 10^9$$$) — the sequence itself.\u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003ePrint \u003cspan class\u003d\"tex-font-style-bf\"\u003eany integer\u003c/span\u003e number $$$x$$$ from range $$$[1; 10^9]$$$ such that exactly $$$k$$$ elements of given sequence is less or equal to $$$x$$$.\u003c/p\u003e\u003cp\u003eIf there is no such $$$x$$$, print \"\u003cspan class\u003d\"tex-font-style-tt\"\u003e-1\u003c/span\u003e\" (without quotes).\u003c/p\u003e"}},{"title":"Examples","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e7 4\n3 7 5 1 10 3 20\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e6\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}},{"title":"","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e7 2\n3 7 5 1 10 3 20\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e-1\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}},{"title":"Note","value":{"format":"HTML","content":"\u003cp\u003eIn the first example $$$5$$$ is also a valid answer because the elements with indices $$$[1, 3, 4, 6]$$$ is less than or equal to $$$5$$$ and obviously less than or equal to $$$6$$$.\u003c/p\u003e\u003cp\u003eIn the second example you cannot choose any number that only $$$2$$$ elements of the given sequence will be less than or equal to this number because $$$3$$$ elements of the given sequence will be also less than or equal to this number.\u003c/p\u003e"}}]}