Problem:
Score: 300 points

Problem Statement

We have N voting papers. The i-th vote (1 \leq i \leq N) has the string S_i written on it.

Print all strings that are written on the most number of votes, in lexicographical order.

Constraints

1 \leq N \leq 2 \times 10^5

S_i (1 \leq i \leq N) are strings consisting of lowercase English letters.

The length of S_i (1 \leq i \leq N) is between 1 and 10 (inclusive).

Input

Input is given from Standard Input in the following format:

N
S_1
:
S_N

Output

Print all strings in question in lexicographical order.

Sample Input 1

7
beat
vet
beet
bed
vet
bet
beet

Sample Output 1

beet
vet

beet and vet are written on two sheets each, while beat, bed, and bet are written on one vote each. Thus, we should print the strings beet and vet.

Sample Input 2

8
buffalo
buffalo
buffalo
buffalo
buffalo
buffalo
buffalo
buffalo

Sample Output 2

buffalo

Sample Input 3

7
bass
bass
kick
kick
bass
kick
kick

Sample Output 3

kick

Sample Input 4

4
ushi
tapu
nichia
kun

Sample Output 4

kun
nichia
tapu
ushi

Solution in C# (Mono 4.6.2.0) (judge verdict: Time Limit Exceeded)

using System;
using System.Collections.Generic;
using System.Numerics;
using System.Linq;
using System.Text;
using static System.Math;

class MainClass
{

    public static void Main(string[] args)
    {
        var N = LnInt();
        var dict =new Dictionary<string, int>();
        for(var i = 0; i < N; i++)
        {
            var S = LnStr();
            if (dict.ContainsKey(S))
            {
                dict[S]++;
            }
            else
            {
                dict[S] = 1;
            }
        }
        var max = dict.Max(x => x.Value);
        var array = dict.Where(i => i.Value== max).Select(x=>x.Key);
        array = array.OrderBy(x => x);
        StringBuilder result = new StringBuilder();
        foreach(var i in array)
        {
            result.AppendLine(i);
        }
        print(result.ToString());
    }

public static long PowLite(long n, long p, int mod = (int)1e9 + 7){long ans = 1;long now = n;for (; p > 0; p >>= 1){if ((p & 1) == 1){ans *= now;ans %= mod;}now *= now;now %= mod;}return ans;}
public static void print(object obj) { Console.WriteLine(obj); }
public static long Gcd(long a, long b) { if (a > b) { var r = a % b; if (r == 0) return b; else return Gcd(b, r); } else { var r = b % a; if (r == 0) return a; else return Gcd(a, r); } }
public static int Gcd(int a, int b) { if (a > b) { var r = a % b; if (r == 0) return b; else return Gcd(b, r); } else { var r = b % a; if (r == 0) return a; else return Gcd(a, r); } }
public static int[] LnInts() { var vs = Console.ReadLine().Trim().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries); var ins = new int[vs.Length]; for (int i = 0; i < vs.Length; i++) ins[i] = int.Parse(vs[i]); return ins; }
public static int LnInt() { var vs = Console.ReadLine().Trim(); return int.Parse(vs); }
public static long[] LnLngs() { var vs = Console.ReadLine().Trim().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries); var ins = new long[vs.Length]; for (int i = 0; i < vs.Length; i++) ins[i] = long.Parse(vs[i]); return ins; }
public static long LnLng() { var vs = Console.ReadLine().Trim(); return long.Parse(vs); }
public static string[] LnStrs() { var vs = Console.ReadLine().Trim().Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries); return vs; }
public static string LnStr() { var vs = Console.ReadLine().Trim(); return vs; }
public static List<T[]> AllPermutation<T>(params T[] array) where T : IComparable{var a = new List<T>(array).ToArray();var res = new List<T[]>();res.Add(new List<T>(a).ToArray());var n = a.Length;var next = true;while (next){next = false;int i;for (i = n - 2; i >= 0; i--){if (a[i].CompareTo(a[i + 1]) < 0) break;}if (i < 0) break;var j = n;do{j--;} while (a[i].CompareTo(a[j]) > 0);if (a[i].CompareTo(a[j]) < 0){var tmp = a[i];a[i] = a[j];a[j] = tmp;Array.Reverse(a, i + 1, n - i - 1);res.Add(new List<T>(a).ToArray());next = true;}}return res;}}