{"trustable":false,"sections":[{"title":"","value":{"format":"HTML","content":"\u003cp\u003e\nWhen we were first introduced to early mathematics in school, we were doing addition, subtraction, multiplication, division by hand. How beautiful the days were!\n\u003cbr\u003e\n\tSuppose, you are Bob. Bob were taught to add multi-digit numbers from right-to-left one digit at a time. Many find the \u0026quot;carry\u0026quot; operation - in which a 1 is carried from one digit position to be added to the next - to be a significant challenge. Your job is to count the number of carry operations for each of a set of addition problems so that educators may assess their difficulty.\u003c/p\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003e\n\tEach line of input contains two unsigned integers less than 10 digits. The last line of input contains 0 0.\u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003e\n\tFor each line of input except the last you should compute and print the number of carry operations that would result from adding the two numbers, in the format shown below.\u003c/p\u003e"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cpre\u003e\n123 456\n555 555\n123 594\n0 0\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cpre\u003e\nNo carry operation.\n3 carry operations.\n1 carry operation.\u003c/pre\u003e"}}]}