Given a number M (that has anywhere from 1 through 9 digits), find andprint the next runaround number higher than M, which will always fitinto an unsigned long integer for the given test data.

• 给你一个数字 M (在1到9位之间), 找出第一个比 M大的循环数, 并且一定能用一个无符号长整形数装下。