using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        int input1=5;

        string[] input2={"A","B","C","D","E"};

        int[] input3 = {3,4,0,1,1};

        Dictionary<int, string> pair = new Dictionary<int, string>();

        for(int i=0;i<input1;i++)

        {

            pair.Add(input3[i], input2[i]);

        }

​

        var list = pair.Keys.ToList();

​

        list.Sort();

​

        Dictionary<int, string> npair = new Dictionary<int, string>();

​

        foreach(int i in list)

        {

            npair.Add(i,pair[i]);

        }

​

        string res=null;

        int j=1;

​

        for(int i=0;i<input1-1;i++)

        {

            if(j==1)

                res=npair.ElementAt(i).Value;

​

            if((npair.ElementAt(i).Key - npair.ElementAt(i+1).Key)==-1 && j<3)

            {

                res+=":"+npair.ElementAt(i+1).Value;

                j++;

            }

            else

            {

                res=null;

                j=1;

            }

​

            if(j==3)

                break;

        }

        if(j==3)

            Console.WriteLine(res);

        else

            Console.WriteLine("NONE");      

    }

}

​