#include <iostream>
using namespace std;

int main() {
	long a,b,c,ans;
	int i = 200;
	i--;
	while( i >= 0){
		cin >> a >> b;
		if(0 <= a  && b <= 1000000){
		ans = 0;
		c = a + b;
		while(c!=0){
		c = c / 10;

		++ans;
	}
	}
	cout << ans << endl;
	}
	return 0;
}