#include<iostream>
using namespace std;
int main(){
	int a,b;
	while(cin >> a >> b){
		int sum = a + b;
		//cout << a << " " << b << " " << sum << endl;
		int n = 1;
		int index = 0;
		while(1){
			if(n > sum) break;
			n *= 10;
			index++;
		}
		//cout << n << " " << index << endl;
		cout << index << endl;
	}
	return 0;
}