#include <iostream>
using namespace std;

int main() {

    int a, b, x, ans;
    
    while (cin >> a >> b) {
        x = a + b;
        ans = 0;
        
        while (x > 0) {
            ans++;
            x /= 10;
           
        }
         cout << ans << endl;
    }

    return 0;
}