Digital Clock Conversion

You are given an integer representing the total number of seconds elapsed since midnight. Your task is to convert this integer into a 24-hour time format string HH:MM:SS.

The conversion should satisfy the following conditions:

• If \(0 \leq \text{seconds} < 86400\), format the time such that hours, minutes, and seconds are each represented with two digits (using leading zeros if necessary).
• If the input is out of the valid range (i.e. \(\text{seconds} < 0\) or \(\text{seconds} \geq 86400\)), output "Invalid input!".

For example, an input of 3661 should return "01:01:01".

inputFormat

The input consists of a single integer \(seconds\) provided via stdin representing the total elapsed seconds since midnight.

outputFormat

Output a single string to stdout that is either the formatted time in "HH:MM:SS" or the string "Invalid input!" if the input is out of range.

0

00:00:00