
#include <iostream>
#include <vector>
#include <algorithm>
#include <string>

using namespace std;

#define rep(i,n) for(int i = 0; i < n; i++)
#define REP(i,j,n) for(int i = j; i < n; i++)


int main(){

	int a,b;

	while(cin >> a >> b){

		int x = 1;
		int sum = a + b;

		while(sum / 10 > 0){
		x++;
		sum = sum / 10;
		}
		cout << x << endl;
	}

	return 0;
}