#include <iostream>
#include <stdio.h>
#include <math.h>
#include <algorithm>
#include <stdlib.h>
using namespace std;
int main(){
    int a,b,count,s;
 
    while(scanf("%d %d",&a,&b)!=EOF){
        count=0;
        s=a+b;
        while(s!=0){
            s/=10;
            count++;
        }
        printf("%d\n",count);
    }
 
    return 0;
}
