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: ts = input()
  h = ts / 3600
  ts -= h * 3600
  m = ts / 60
  ts -= m * 60
  text = str(h) + ":" + str(m) + ":" + str(ts)
  print(text)
  
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"}]