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: Runtime Error)

using System;
using System.Collections.Generic;
using System.Linq;

namespace abc151b
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> input1 = Console.ReadLine().Split(' ').Select(int.Parse).ToList();
            List<int> input2 = Console.ReadLine().Split(' ').Select(int.Parse).ToList();

            double answer = input1[0]* input1[2] - input2.Sum();
            double output;


            if (answer<= input1[1])
            {
                output = answer;
                if (answer < 0)
                {
                    output = 0;
                }

            }
            else
            {
                output = -1;
            }



            Console.WriteLine(output);



        }
    }
}