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

int main(){
	int a, b;
	list<int> digit;
	
	while((cin>>a>>b).eof()){
		if((a+b)>0){
			string stream c << a+b;
			digit.push_back(c.str().size());
		}
		
	}
	list<int>::iterator it = digit.begin();
	while(it != digit.end()){
		cout << *it << endl;
		it++;		
	}
	
 	return 0;
}