#include <iostream>
using namespace std;

int main() {
	int a, b;
	while(cin >> a >> b) {
		int c = a + b;
		
		if (c < 10) {
			cout << 1 << endl;
		} else if (c < 100) {
			cout << 2 << endl;
		} else if (c < 1000) {
			cout << 3 << endl;
		} else if (c < 10000) {
			cout << 4 << endl;
		} else if (c < 100000) {
			cout << 5 << endl;
		} else if (c < 1000000) {
			cout << 6 << endl;
		} else {
			cout << 7 << endl;
		}
	}
}