#include <stdio.h>

int count_vowels(char *str){
    int count = 0;
    for (int i = 0; str[i]; i++){
        char ch = tolower(str[i]);
        if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u'){
            count++;
        }else if (!isalpha(str[i])){
            printf("Invalid Input\n");
            return -1; // Indicate invalid input
        }
    }
return count;
}
int main(){
    char input[100];
    fgets(input, sizeof(input), stdin);
    input[strcspn(input, "\n")] = 0; // Remove newline
    int voewl_count = count_vowels(input);
    if (voewl_count != -1){
        printf("%d\n" , vowel_count);
    }
return 0;
}