Yes now have execution timed out error. I am using two for loops and the attempt speed is around 619ms. I will figure it out thanks a lot

not an issue, it's "on purpose". You have to find a way to find your info efficiently ("very"... efficiently...)

good work guys, keep it up!

I see. thanks for this. I will try to reduce the memory allocation.

I had the same issue. I think it means that the memory is being exhausted. Your code is probably correct and runs with time efficiency, but not memory efficiency

So how is possible to look up all substrings of an str in single for loop ? The other idea is that maybe it should think as a cluster and we can find the sub clusters which has only vowels etc but still not decide correct algorithm

I've missed first line of description. nice :)

Description:

{a,e,i,o,u,A,E,I,O,U}

That's in the instructions.

Pretty much fun with creating one-liner in python :D

Imo this should be explicitly said that 'Y' is not vowel in this case.
At least one of simple tests will test that.