#include <bits/stdc++.h>
using namespace std;

int main(){
	int a,b;
	while(	cin >> a >> b ){
		int s = a+b;
		int ans = 0;
		while(s){
			ans++;
			s /= 10;
		}
		if( a+b == 0 ) cout << 1 << endl;
		else cout << ans << endl;
	}
}