Problem:
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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.

Input

An integer $S$ is given in a line.

Output

Print $h$, $m$ and $s$ separated by ':'. You do not need to put '0' for a value, which consists of a digit.

Constraints

$0 \leq S \leq 86400$

Sample Input 1

46979

Sample Output 1

13:2:59

Solution in Ruby (judge verdict: Wrong Answer)

# ????????????
time = STDIN.gets.chomp.to_i
str = ""
flag = false
3.times do
  second = time % 60
  time /= 60
  if second != 0 then
    if flag then
      str = ':' + str
    end
    str = second.to_s + str
    flag = true
  end
end
puts str