def format(t):
    """
    converts time in tenths of seconds into formatted string A:BC.D
    """
    milliseconds = t % 10
    seconds = (t // 10) % 60
    minutes = (t // 10) // 60

    if seconds < 10:
        return str(minutes) + ":" + "0" + str(seconds) + "." + str(milliseconds)
    else:
        return str(minutes) + ":" + str(seconds) + "." + str(milliseconds)