#include <iostream>

using namespace std;

int main(int argc, char** argv)
{
    int a, b;
    while (cin >> a >> b) {
        int sum = a + b;
        int digit = 0;
        while (sum > 0) {
            sum /= 10;
            digit++;
        }
        cout << digit << endl;
    }
    return 0;
}