#include <sstream>
#include <iostream>
#include <string>
 
using namespace std;

int main(){
	int a,b,n;
	cin >> a>>b;
	n=a+b;
	int ans = 1;
	while(n>=10){
		n/=10;
		ans++;
	}
	cout << ans << endl;
	return 0;
}