##Write a function, which takes a non-negative integer (seconds) as input and returns the time in a human-readable format (HH:MM:SS)
# HH = hours, padded to 2 digits, range: 00 - 99
# MM = minutes, padded to 2 digits, range: 00 - 59
# SS = seconds, padded to 2 digits, range: 00 - 59
# The maximum time never exceeds 359999 (99:59:59)
# You can find some examples in the test fixtures.

def make_readable(seconds):
    m,s = divmod(seconds, 60)
    h, m = divmod(m, 60)
    return "{:02d}:{:02d}:{:02d}".format(h, m ,s)


print(make_readable(33939))