Problem:
Score : 100 points

Problem Statement

Given are two strings S and T consisting of lowercase English letters. Concatenate T and S in this order, without space in between, and print the resulting string.

Constraints

S and T are strings consisting of lowercase English letters.

The lengths of S and T are between 1 and 100 (inclusive).

Input

Input is given from Standard Input in the following format:

S T

Output

Print the resulting string.

Sample Input 1

oder atc

Sample Output 1

atcoder

When S = oder and T = atc, concatenating T and S in this order results in atcoder.

Sample Input 2

humu humu

Sample Output 2

humuhumu

Solution in Ruby (2.3.3) (judge verdict: Runtime Error)

a, b, k = gets.strip.split.map(&:to_i)
c = k - a
if a == 0 && b == 0
  puts "#{a} #{b}"
else
  if c > 0
    d = b - c
    if d > 0
      puts "0 #{d}"
    else
      puts "0 #{c - b}"
    end
  else
    puts "#{a - k} #{b}"
  end
end