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