#include<stdio.h>
#include<iostream>
using namespace std;
int main(){
	int a = 0, b = 0;
	int i = 0;
	cin >> a >> b;
	int c = a + b;
	if (a + b < 10){
		cout << "1" << endl;
	}
	else if (a + b < 100){
		cout << "2" << endl;
	}
	else if (a + b < 1000){
		cout << "3" << endl;
	}
	else if (a + b < 10000){
		cout << "4" << endl;
	}
	else if (a + b < 100000){
		cout << "5" << endl;
	}
	else if (a + b < 1000000){
		cout << "6" << endl;
	}
	else{
		cout << "7" << endl;
	}
	return 0;
}