#include <stdio.h>
#include <stdlib.h>
#define N 4

void func(int a, int b)
{
  int i, t;
  char sa[N + 2], sb[N + 2];

  sprintf(sa, "%0*d", N + 1, a);
  sprintf(sb, "%0*d", N + 1, b);
  for (i = N; i ; --i) {
    t = sa[i] - '0' + sb[i] - '0';
    sa[i - 1] += t / 10;
    sa[i] = t % 10 + '0';
  }
  printf("result = %s\n", sa);

}

int main()
{
  int a, b;

  printf("a b = ");
  scanf("%d %d", &a, &b);
  func(a, b);

  return 0;
}