#include<iostream>
#include<cstdio>
using namespace std;

int main()
{
        int a, b, i;
        int sum;        

        while(scanf("%d %d", &a, &b) != EOF){
                sum = a + b;
                for(i=0; sum>0; i++){
                        sum /= 10;
                }

                cout << i << endl;
        }

        return 0;
}