#include <iostream>
using namespace std;

int main() {
	int a, b;

	while(cin >> a >> b) {
		a += b;
		int t = 1, cnt = 0;
		while(1) {
			if( a < t ) {
				break;
			} else {
				t *= 10;
				++cnt;
			}
		}
		cout << cnt << endl;
	}
}