Maybe you should check arr for null value... ;-)

but I get the Timeout error....

I got the same error! Were you able to pass the last test?

because that is the maximum we can get from that array

4 vars, no function.

Find the numbers that would represent the ASCII value of a vowel, and replace that element of the array with the equivilent in a string format. As you can see in the example, 105 should be changed to a "i".

wait, bad idea... x)

try this one: "abc123def"

try with this "123...skjghskjghhfg555!!!"

and outputs the sum (also as a string)

Read the instructions again, your function returns numbers (0 is a number, '0' is a string). And mark your post as having spoiler content when you post code like you did, please.

If the value entered is a string it should return "Error"

You're returning "Error" if the value is not an int.

why print() ?

If N is outside of the array, then return -1

That's a note for people doing SQL version, you've done Python so far, so you can ignore it.