//泥臭いなあ
#include <iostream>
#include <cstdio>

int main()
{
        using namespace std;
        long int a,b;
        unsigned long int div;

        while(1){

        cin >> a;
        if(a == EOF)break;
        cin >> b;
        div = (a+b)/10;

        if(div == 0)cout <<1<<"\n";
        else if(1 <= div && div <= 9)cout <<2<<"\n";
        else if(10 <= div && div <= 99)cout <<3<<"\n";
        else if(100 <= div && div <= 999)cout <<4<<"\n";
        else if(1000 <= div && div <= 9999)cout <<5<<"\n";
        else if(10000 <= div && div <= 99999)cout <<6<<"\n";
        else if(100000 <= div && div <= 200000)cout <<7<<"\n";
        }

        return 0;
}