/* -*- coding: utf-8 -*-
 *
 * 706.cc: No.706 多眼生物の調査 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_K = 1000;

/* typedef */

/* global variables */

int es[MAX_K];

/* subroutines */

/* main */

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

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

  int maxe = -1, maxk = -1;
  for (int k = MAX_K - 1; k >= 0; k--)
    if (maxe < es[k]) maxe = es[k], maxk = k;

  printf("%d\n", maxk);
  return 0;
}