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: Wrong Answer)

function main(input) {
  var c = input;
  var alphabet = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l",
       "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"];
  var result = alphabet.indexOf(c);
  return alphabet[result + 1];
}
console.log(main(require('fs').readFileSync('/dev/stdin', 'utf8')));