#include <iostream>
#include <math.h>
#include <string>
#include <algorithm>
#include <vector>
using namespace std;
int kaijo(int n){
	int ans = 1;
	if (n != 0){
		for (int i = 0; i < n; i++){
			ans *= (n - i);
		}
	}
	else{
		ans = 1;
	}
	return ans;
}

int main(){
	int a, b;
	int c;
	int n;
	while (cin >> n){
		cin >> a >> b;
		c = log10(a + b);
		cout << c + 1 << endl;
	}
	return 0;
}