We will create a set of vowels using set() method. Since both uppercase and lowercase vowels have to be considered, we will convert the string to lower case. Then we will iterate over the string and if any character is a vowel, we will delete it from the vowel set using remove().
In the end, we will check the length of the vowel set. If the length is 0 then the string will be accepted else the string will not be accepted. The set() function will convert any of the iterable to the sequence of iterable elements with distinct elements, commonly called Set.