#include <iostream>
#include <cstdio>
#include <cmath>

using namespace std;

int main(){
  int sum, ans, n1, n2;
  while(cin>>n1>>n2){
    sum = n1+n2;
    ans = (int)log10((double)sum) + 1;
    cout<<ans<<endl;
}
  return 0;
}