Words in JS. Слова в JS.

Question

Помогите пожалуйста, не получается решить.
https://code.sololearn.com/WFWuIWq2D7cO/?ref=app

Answer 1

Narzullayeva Oyshabonu , in the z variable there is no argument ","
I think some changes were made in the task and previously it had "," now it doesn't.