#include <cstdio>
#include <string>

int main() {
    int ch;
    int a, b;
    char str[255];
    ch = 0;
    while (ch != EOF) {
          scanf("%d %d", &a, &b);
          sprintf(str, "%d", a + b);          
          printf("%d\n", strlen(str));   
          ch = getchar();
    }
}