#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;


int main(){
  int N;
  cin >> N;

  map<int,int> memo;
  rep(i,N){
    string str;
    cin >> str;
    memo[str.length()-2]++;
  }

  int best_eye = 0;
  int best_cnt = 0;
  for(auto& x : memo){
    if(best_cnt == x.second){
      if(best_eye < x.first){
        best_eye = x.first;
      }
    }
    else if(best_cnt < x.second){
      best_cnt = x.second;
      best_eye = x.first;
    }
  }

  cout << best_eye << endl;
  
  return 0;
}