#include<iostream>
#include<string>
#include<queue>
using namespace std;
int main(){
	string str,str1;
	int num,num1,sum,count=0,a,b;
	while(cin>>num>>num1){
		sum=num+num1;
		a=sum;
		b=sum;
		for(;;){
			a/=10;
			count++;
			if(a==0 ){
				break;
			}
		}
		cout<<count<<endl;
		a=0;count=0;sum=0;
	}
}