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 JavaScript (node.js v5.12) (judge verdict: Accepted)

const alphabet = 'abcdefghijklmnopqrstuvwxyz';

function Main(input) {
  const inputCharNum = alphabet.indexOf(input.trim());
  console.log(alphabet[inputCharNum + 1]);
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));