using System;

using System.Collections.Generic;

public static class Program

{

    public static void Main()

    {

        Console.WriteLine(CountVowels("^a*b#c0d1e2f3ghi   jklmnopqrstuvwxyzaaa$"));

    }

    /// <summary>

    /// This method counts the numbers of each vowel in the input string and returns

    /// a string encoding the result in the following form: "a:3 e:0 i:2 o:3 u:3".

    /// <summary>

    public static string CountVowels(string input)

    {

        // TODO: Fill in code here.

    }

}