Problem:
Score: 100 points

Problem Statement

A triple of numbers is said to be poor when two of those numbers are equal but the other number is different from those two numbers.

You will be given three integers A, B, and C. If this triple is poor, print Yes; otherwise, print No.

Constraints

A, B, and C are all integers between 1 and 9 (inclusive).

Input

Input is given from Standard Input in the following format:

A B C

Output

If the given triple is poor, print Yes; otherwise, print No.

Sample Input 1

5 7 5

Sample Output 1

Yes

A and C are equal, but B is different from those two numbers, so this triple is poor.

Sample Input 2

4 4 4

Sample Output 2

No

A, B, and C are all equal, so this triple is not poor.

Sample Input 3

4 9 6

Sample Output 3

No

Sample Input 4

3 3 4

Sample Output 4

Yes

Solution in C# (Mono 4.6.2.0) (judge verdict: Runtime Error)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {

            int inputCount = int.Parse(Console.ReadLine());

            Dictionary<string, int> countDic = new Dictionary<string, int>();
            List<string> strList = new List<string>();
            for (int loop = 0; loop < inputCount; loop++)
            {
                string tmp = Console.ReadLine();
                if (!countDic.ContainsKey(tmp))
                {
                    countDic.Add(tmp, 0);
                }
                countDic[tmp]++;
            }

            //List<string> maxKeyList = new List<string>();
            //int maxCnt = 0;
            //foreach (var data in countDic) {
            //    if (maxCnt < data.Value) {
            //        maxKeyList.Clear();
            //        maxKeyList.Add(data.Key);
            //        maxCnt = countDic[data.Key];
            //    }
            //    else if (data.Value == maxCnt) { 
            //        maxKeyList.Add(data.Key);
            //    }
            //}

            int maxCnt = countDic.Values.Max();
            List<string> maxKeyList = new List<string>();
            foreach (string key in countDic.Keys)
            {
                if (countDic[key] == maxCnt)
                {
                    maxKeyList.Add(key);
                }
            }

            maxKeyList.Sort((a, b) => string.Compare(a, b));
            foreach (string str in maxKeyList) {
                Console.WriteLine(str);
            }
            Console.ReadLine();
        }
    }
}