#include<iostream>
using namespace std;

int main(){
	int a,b,c;
	
	while(!cin.eof()){
		cin>>a;
		cin >> b;
		c = a+b;
		int count = 1;
if(c==0){
cout<<0;
continue;
}
		while(c > 9){
			count++;
			c /=10;
		}

		cout<<count;
		
	}
	return 0;
}