r is 14
2x14=28
3x14=42

I ain't good at meth... ups I mean math...

lol I had to be like "dur... what was a common factor again?' I hate math ._.

thx

Ah, we discussed the Euclidean Algorithm in a lecture just last week! (And yesterday as well, because it went with the Chinese remainder theorem.)

Rfuck yeah.

Thanks a lot !!

Twenty eight and forty two.
If r is the gretest factor then we search for the longest common part of the two words. And it's... :
TY! (or tw, but let's ignore that :D )