Programming challenge.

Question

WAP to enter two sentences and print all common words in both the sentences. The same word should not be printed more than once.

like
String 1 : I am don the don is badman
String 2 : The don is a good .
output
common words are
The
Don

Answer 1

https://code.sololearn.com/cQHPnKhDV1LN/?ref=app

Answer 2

Add the removing of the non-alpha symbols.
https://code.sololearn.com/cXpwTc8iAikT/?ref=app

Answer 3

https://www.sololearn.com/discuss/1082512/?ref=app