Reversing the words on multiples lines in a file

[left thistle]

I have tried many different codes but all of them have failed, I can't figure out how to reverse the words and not the lines.

This is what I have so far...

myfile = open("Input.txt", "r")

mylist = myfile.readlines()

myfile.close()

lines = ''.join(mylist)

while lines != :

print(lines)

Which im not too sure is correct