output_description: Print the resulting string.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      S T
attempt: import sys
  
  input = sys.stdin.readline
  S, T = input().rstrip().split()
  
  
  def resolve():
      print(T + S)
  
  
  import sys
  from io import StringIO
  import unittest
  
  
  class TestClass(unittest.TestCase):
      def assertIO(self, input, output):
          stdout, stdin = sys.stdout, sys.stdin
          sys.stdout, sys.stdin = StringIO(), StringIO(input)
          resolve()
          sys.stdout.seek(0)
          out = sys.stdout.read()[:-1]
          sys.stdout, sys.stdin = stdout, stdin
          self.assertEqual(out, output)
  
      def test_入力例_1(self):
          input = """oder atc"""
          output = """atcoder"""
          self.assertIO(input, output)
  
      def test_入力例_2(self):
          input = """humu humu"""
          output = """humuhumu"""
          self.assertIO(input, output)
  
  
  if __name__ == "__main__":
      # unittest.main()
      resolve()
  
problem_description: 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.
samples: [{"input": "oder atc", "output": "atcoder\n    \n\nWhen S =  `oder` and T =  `atc`, concatenating T and S in this order results\nin `atcoder`.\n\n* * *"}, {"input": "humu humu", "output": "humuhumu"}]