#include <iostream>
 
int main(){
    u_int a, b;
     
    while(std::cin >> a >> b){
        u_int n = a + b;
        u_int count = 1;
        
        while(n / 10 != 0){
            n /= 10;
            ++count;
        }
        std::cout << count << std::endl;
    }
    return 0;
}