#include <iostream>
using namespace std;
int main() {
    int number;
    int digit = 0;
    int a, b;
    while (cin >> a >> b) {
        digit=0;
        number = a + b;
        while (number != 0) {
            number = number / 10;
            ++digit;
        }
        cout << digit << endl;
    }
    return 0;
}