Python-Min/max of seq WITHOUT min() and max()

Given a sequence such as x = [5, 9, 0, -14], I need to find the min and max without sorting the sequence or by using min() and max().  I've been instructed to use loop constructs, but I can't figure out how to do so.  Help is greatly appreciated.

To find the min:
reduce(lambda x,y: x if x < y else y, [5, 9, 0, -14])

To find the max:
reduce(lambda x,y: x if x > y else y, [5, 9, 0, -14])