Find all the substrings by using two loops. Use a variable max to record the maximum length of the substring that meets the condition. For each substring, count the numbers of vowels. If all numbers ...

A substring is a contiguous (non-empty) sequence of characters within a string. A vowel substring is a substring that only consists of vowels ('a', 'e', 'i', 'o', and 'u') and has all five vowels ...