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: Accepted)

S = gets.chomp.to_s              # 文字列。chompを付けないと改行文字がついてくる
moji = ('a'..'z').to_a  #配列
ans = 0
while ans < 27 do
  if moji[ans] == S then
    ans = ans + 1
    break
  end
  ans = ans + 1
end

puts moji[ans]