def printSolution(day, part, solution, test=None, test_case=0, exec_time=None):
    if exec_time is None:
        time_output = ""
    else:
        units = ['s', 'ms', 'μs', 'ns']
        unit = 0
        while exec_time < 1:
            exec_time *= 1000
            unit += 1

        time_output = " (Average run time: %1.2f%s)" % (exec_time, units[unit])

    if test is not None:
        print(
            "(TEST case%d/day%d/part%d) -- got '%s' -- expected '%s' -> %s"
            % (test_case, day, part, solution, test, "correct" if test == solution else "WRONG")
        )
    else:
        print("Solution to day %s, part %s: %s%s" % (day, part, solution, time_output))