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: Runtime Error)

n,m = gets.split.map(&:to_i)
x = Array.new(n+1,0)
 
ans0 = 0
ans1 = 0
m.times do
    pp,s = gets.chomp.split
    pp = pp.to_i
    next if x[pp] == -1
    #正解なら正解ポイントをプラスして溜まった不正解ポイントをたす、そしてフラグを-1にして立てておく
    #同じ問題が出るとx[pp]が−１になってるからnextで飛ばして次にいってくれる。
    if s == "AC"
        ans0 += 1
        ans1 += x[pp]
       x[pp] = -1
    else
        x[pp] += 1
    end
end
puts 0
puts "#{ans0} #{ans1}"