import java.util.Scanner;

public class Main{
    public static void main(String[] args) {
        String s = new Scanner(System.in).nextLine();
        //s：字符串的长度
        int i, n = s.length();
        //循环每一个字符
        for (i = 0; i < n; i++) {
            if (s.charAt(i) == 'a' || s.charAt(i) == 'e' || s.charAt(i) == 'i' || s.charAt(i) == 'o' || s.charAt(i) == 'u') {
                System.out.print(i + 1);
                return;
            }
        }
        System.out.print(0);
    }
}

/**************************************************************
	Problem: 1844
	User: admin
	Language: Java
	Result: Accepted
	Time:1753 ms
	Memory:40240 kb
****************************************************************/