#include<iostream>
#include<stdio.h>
#include<string.h>
using namespace std;

int main(){
unsigned long int a,b,s,i;
while(cin>>a>>b)
{
    s=a+b;
    i=0;
    do
    {
      s/=10;
      i++;
    }
    while(s!=0);
    cout<<i<<"\n";
}
    return 0;
}