#include <iostream>
#include <algorithm>
#include <cstdio>
#include <string>

using namespace std;

int main(){
	int a, b, c, s;
	while(cin >> a >> b){
		c = 1;
		s = a + b;
		while(s = s / 10, s){
			c++;
		}
		cout << c << "\n";
	}
	return 0;
}