output_description: Print $h$, $m$ and $s$ separated by ':'. You do not need to put '0' for a
  value, which consists of a digit.
input_description: An integer $S$ is given in a line.
attempt: in_time = int(input())
  if 0 <= in_time < 86400:
      tmp1 = 60**2
      h = in_time // tmp1
      tmp2 = in_time % tmp1
      m = tmp2 // 60
      t = tmp2 % 60
      print(str(h) + ":" + str(m) + ":" + str(t))
  
problem_description: Watch
  
  Write a program which reads an integer $S$ [second] and converts it to $h:m:s$
  where $h$, $m$, $s$ denote hours, minutes (less than 60) and seconds (less
  than 60) respectively.
samples: [{"input": "46979", "output": "13:2:59"}]