#include	<iostream>

using namespace std;

int main(void) {
	while(1) {
		int a, b;
		int sum = 0, g = 1;
		
		cin >> a;
		if( cin.eof() )	{ break; }
		
		cin >> b;
		sum += a + b;
		
		while(sum >= 10) {
			g++;
			sum /= 10;
		}
		cout << g << endl;
	}
	
	return 0;
}