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 PHP7 (7.0.15) (judge verdict: Accepted)

<?php

$c = trim(fgets(STDIN));

$a = "abcdefghijklmnopqrstuvwxyz";

for ($i=0; $i<strlen($a); $i++) {
    if ($a[$i] == $c) {
        echo $a[$i+1]."\n";
        break;
    }
}