Problem:
Mode Value

Your task is to write a program which reads a sequence of integers and prints mode values of the sequence.
The mode value is the element which occurs most frequently.

Input

A sequence of integers ai (1 ≤ ai ≤ 100). The number of integers is less than or equals to 100.

Output

Print the mode values. If there are several mode values, print them in ascending order.

Sample Input

5
6
3
5
8
7
5
3
9
7
3
4

Output for the Sample Input

3
5

For example, 3 and 5 respectively occur three times, 7 occurs two times, and others occur only one. So, the mode values are 3 and 5.

Solution in C# (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;

namespace AOJ
{
    class Program
    {
        static IEnumerable<string> ReadLines()
        {
            string line;
            while((line = Console.ReadLine()) != null)
            {
                yield return line;
            }
        }
        static void Main(string[] args)
        {
            var d = ReadLines()
                .Select(int.Parse)
                .GroupBy(x => x)
                .Select(x => new {x.Key, Length = x.Count()})
                .OrderByDescending(x => x.Length)
                .ToList();
            foreach(var v in
                d
                    .TakeWhile(x => x.Length == d.First().Length)
                    .OrderBy(x => x.Key))
            {
                Console.WriteLine(v.Key);
            }
        }
    }
}