#include <iostream>


using namespace std;

int main(){
	int a;
	int b;
	

	for (int i = 0; i < 200; i++){
		int d=0;
		cin >> a >> b;
		int  c = a + b;
		for ( d = 1; c >= 10; d++)
		{
			c = c / 10;
		}
		cout << d << endl;
	}


















	return 0;
}