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

using namespace std;

int main(){
  int a,b;
  while(cin>>a>>b){
    int c = a+b;
    int ans = 0;
    while(c > 0){
      ans++; c/=10;
    }
    cout << ans << endl;
  }
  return 0;
}