Problem:
Score : 100 points

Problem Statement

Given is a lowercase English letter C that is not z. Print the letter that follows C in alphabetical order.

Constraints

C is a lowercase English letter that is not z.

Input

Input is given from Standard Input in the following format:

C

Output

Print the letter that follows C in alphabetical order.

Sample Input 1

a

Sample Output 1

b

a is followed by b.

Sample Input 2

y

Sample Output 2

z

y is followed by z.

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using static System.Console;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 自作プログラムテスト
{
    class Program
    {
        const int mod = 100000007;

        static void Main(string[] args)
        {
            string C = ReadLine();
            char ans = ' ';

            switch (char.Parse(C)) 
            {
                case 'a':
                    ans = 'b';
                    break;
                case 'b':
                    ans = 'c';
                    break;
                case 'c':
                    ans = 'd';
                    break;
                case 'd':
                    ans = 'e';
                    break;
                case 'e':
                    ans = 'f';
                    break;
                case 'f':
                    ans = 'g';
                    break;
                case 'g':
                    ans = 'h';
                    break;
                case 'h':
                    ans = 'i';
                    break;
                case 'i':
                    ans = 'j';
                    break;
                case 'j':
                    ans = 'k';
                    break;
                case 'k':
                    ans = 'l';
                    break;
                case 'l':
                    ans = 'm';
                    break;
                case 'm':
                    ans = 'n';
                    break;
                case 'n':
                    ans = 'o';
                    break;
                case 'o':
                    ans = 'p';
                    break;
                case 'p':
                    ans = 'q';
                    break;
                case 'q':
                    ans = 'r';
                    break;
                case 'r':
                    ans = 's';
                    break;
                case 's':
                    ans = 't';
                    break;
                case 't':
                    ans = 'u';
                    break;
                case 'u':
                    ans = 'v';
                    break;
                case 'v':
                    ans = 'w';
                    break;
                case 'w':
                    ans = 'x';
                    break;
                case 'x':
                    ans = 'y';
                    break;
                case 'y':
                    ans = 'z';
                    break;
            }

            WriteLine(ans);
        }
    }
}