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: try:
      (n) = int(input())
  except:
      exit
  
  hh = n // 3600
  mm = (n % 3600) // 60
  ss = n % 60
  
  # print ('{:0=2}:{:0=2}:{:0=2}'.format(hh,mm,ss))
  print("{}:{}:{}".format(hh, mm, ss))
  
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"}]