1. #include<stdio.h>
  2. #include<math.h>

  1. int digit(int n, int m, int i)
  2. {
  3.     while (m)
  4.     {
  5.         return digit(n / 10, m - 1, i + 1) + (n % 10 * pow(10.0, i));
  6.     }
  7.     return 0;
  8. }

  1. int main()
  2. {
  3.     int n = 0, m = 0, i = 0;
  4.     scanf("%d %d", &n, &m);
  5.     int ret = digit(n, m, i);
  6.     printf("%d", ret);
  7.     return 0;
  8. }