#include <iostream>
#include <cstdio>
#include <vector>
#include <queue>
#include <stack>
#include <map>
#include <string>
#include <algorithm>

using namespace std;

int main (int argc, char *argv[]) {
    int a, b;
    while (scanf("%d %d", &a, &b)) {
        int sum = a + b;
        string str = to_string(sum);
        cout<<str.length()<<endl;
    }
    return 0;
}
