#include <iostream>
using namespace std;
 
int main() {
    int a, b;
 
    while(cin >> a >> b) {
        a += b;
        int t = 1, cnt = 0;
        while(1) {
            if( a < t ) {
                break;
            } else {
                t *= 10;
                ++cnt;
            }
        }
        cout << cnt << endl;
    }
}