#include<iostream>
using namespace std;
int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    long long x,y,z;
    int count;
    while(cin >> x >> y){
        z = x + y;
        count=1;
        while(z/=10){
            count++;
        }
        cout<<count<<"\n";
    }
}