output_description: Print the desired string in one line.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      S
      w
attempt: S, W = (input() for T in range(0, 2))
  print("".join(S[TW] for TW in range(0, len(S), int(W))))
  
problem_description: Statement
  
  You are given a string S consisting of lowercase English letters. We will
  write down this string, starting a new line after every w letters. Print the
  string obtained by concatenating the letters at the beginnings of these lines
  from top to bottom.
samples: [{"input": "abcdefgh\n    3", "output": "adg\n    \n\nWhen we write down `abcdefgh`, starting a new line after every three letters,\nwe get the following:\n\nabc  \ndef  \ngh\n\nConcatenating the letters at the beginnings of these lines, we obtain `adg`.\n\n* * *"}, {"input": "lllll\n    1", "output": "lllll\n    \n\n* * *"}, {"input": "souuundhound\n    2", "output": "suudon"}]