using System.Collections.Generic;

using System.Linq;

using static System.Console;

public class Program

{

    public static void Main()

    {

        var result = Transform("abcde");

        result.ToList().ForEach(WriteLine);

    }

    public static IEnumerable<string> Transform(string str)

    {

        foreach (var w in str)

        {

            var split = str.Split(w);

            yield return  split[0] + char.ToUpper(w) + split[1];

        }

    }

}