using System;

​

public class Program

{

    public static void Main()

    {

        var input = "ASD";

        var first = char.ToLower(input[0]) + input.Substring(1);

        var last = input.Substring(0, input.Length - 1) + char.ToLower(input[input.Length - 1]);

        Console.WriteLine(first);

        Console.WriteLine(last);

    }

}