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 Ruby (2.3.3) (judge verdict: Wrong Answer)

c = gets
arr=[*'a'..'z']

idx=0

arr.each_with_index do |v, i|
  #puts "#{v} #{i}"
  if v == c
    idx = i+1
  end
end

puts arr[idx]