JAVA Back Track
\nclass Solution {\n    //String vowels = "aeiou";\n    int count = 0;\n    public int countVowelStrings(int n) {\n        backTrack(n, 0);\n        return coun
```\nclass Solution {\n    //String vowels = "aeiou";\n    int count = 0;\n    public int countVowelStrings(int n) {\n        backTrack(n, 0);\n        return count;\n    }\n    private void backTrack(int n, int indexToStart){\n        if(n == 0){\n            count++;\n            return;\n        }\n        for(int i = indexToStart; i < 5; i++){\n            backTrack(n - 1, i);\n        }\n    }\n}\n```
['Backtracking', 'Java']