using System;

public class Program
{
    static public char readSingleCharacter()
    {
        const uint singleCharacterStringLength = 1;
        const uint indexOfFirstStringCharacter = 0;

        bool isEnterCorrect = false;
        string inputString = "";

        while (false == isEnterCorrect)
        {
            Console.WriteLine("Enter character:");
            inputString = Console.ReadLine();

            if (singleCharacterStringLength == inputString.Length)
            {
                isEnterCorrect = true;
            }
            else
            {
                Console.WriteLine("Error! Enter single character.");
            }
        }

        return inputString[(int)indexOfFirstStringCharacter];
    }

    public static void Main(string[] args)
    {
        char character = readSingleCharacter();
        int characterInIntegerRepresentation = (int)character;
        int previousCharacterInIntegerRepresentation = characterInIntegerRepresentation - 1;
        int nextCharacterInIntegerRepresentation = characterInIntegerRepresentation + 1;

        Console.WriteLine("Input character is: " + character + " in integer representation: " + characterInIntegerRepresentation);
        Console.WriteLine("Previous character is: " + (char)previousCharacterInIntegerRepresentation + " in integer representation: " + previousCharacterInIntegerRepresentation);
        Console.WriteLine("Next character is: " + (char)nextCharacterInIntegerRepresentation + " in integer representation: " + nextCharacterInIntegerRepresentation);
    }
}