#include <iostream>
using namespace std;

int main(){
  int n;
  cin >> n;
  int a[1001]={};
  string s;
  for(int i=0;i<n;i++){
    cin >> s;
    a[s.size()-2]++;
  }

  int most=0,m;

  for(int i=0;i<1001;i++){
    if(a[i]>=most){most=a[i];m=i;}
  }
  cout << m << endl;
  return 0;
}