#include <iostream>
using namespace std;

int main(void)
{
    int a, b;
    while(cin >> a >> b) {
        int c = a + b;
        for (int i = 1; i < 10; ++i) {
            c /= 10;
            if (c == 0) {
                cout << i << endl;
                break;
            }
        }
    }
    return 0;
}
