#include <iostream>
using namespace std;
 
int main(){
    int x,y;
    int tmp;
    int count = 0;
    while(cin >> x >> y){
        tmp = x + y;
        count = 0;
        while(tmp != 0){
            tmp /= 10;
            count++;
        }
        cout << count << endl;
    }
    return 0;
}       