/* AOJ0002 Digit Number */

#include <stdio.h>

int sum_digits(int n, int base)
{
    int count = 0;

    while(n) {
        count++;
        n /= base;
    }

    return count;
}

int main(void)
{
    int a, b;

    while(~scanf("%d%d", &a, &b))
        printf("%d\n", sum_digits(a + b, 10));

    return 0;
}
