#include<iostream>
using namespace std;
int main() {
	int a, b;
	while (cin >> 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 if (a + b < 10000000) {
			cout << 7 << endl;
		}
	}
}