#include<iostream>

using namespace std;

int main(void){
	
	int a,b;
	
	while(cin>>a>>b){
		
		
		long c=a+b;
		int digit=0;
		while(c>0){
			
			digit++;
			c/=10;
			
		}
		
		cout<<digit<<endl;
		
	}
	
	
	return 0;
}
