문자 출력

using System;
using System.Diagnostics.CodeAnalysis;
using System.Diagnostics.SymbolStore;
using System.Runtime.CompilerServices;

namespace LearnDotnet
{
    internal class Program
    {
        
        static void Main(string[] args)
         {
            Console.Write("문자를 입력하세요: ");
            string input = Console.ReadLine();
            char charInput = Convert.ToChar(input);
            
            for (int i = 0; i <4; i++)
            {
                Console.WriteLine("{0}:{1}", (char)(97+i), (int)charInput+i);
                
            }
        }
    }
}