Problem Description

You are given a string $ S $ consisting of lowercase English letters with a length of $ N $. Find the total number of vowel characters in $ S $, which are a, i, u, e, and o.

Input Format

The input is given from the standard input in the following format:

$ N $ $ S $

Output Format

Output the total number of vowel characters in $ S $, which are a, i, u, e, and o.

Sample Input and Output

Sample Input #1

8
joiyosen

Sample Output #1

4

Sample Input #2

6
bitaro

Sample Output #2

3

Notes/Hints

Constraints

• $1 \leq N \leq 50$.
• $ S $ is a string of length $ N $.
• Each character in $ S $ is a lowercase English letter.

Sample Explanation 1

The vowel characters are _oi_o_e_, which totals to 4.

Sample Explanation 2

The vowel characters are _i_a_o, which totals to 3.

见题面 Input 部分

见题面 Output 部分