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
  
//1問目
while ($line = fgets(STDIN)) {
   $tmp[] = trim($line);
}

// 配列の各要素をさらに分解します
foreach ($tmp as $key => $value) {
  $array[] = explode(" ", $value);
}

$c = $array[0][0];
$answer = ++$c;
echo $answer;