#include<stdio.h>
int main(){
    char arr[100];
    int count=0;
    
    for(int i=1;i>0;i++){
        scanf("%c",&arr[i]);}
    for(int i=1;i>0;i++){
    switch(arr[i]){
        case 'a':
        count++;
        break;
        case 'e':
        count++;
        break;
        case 'i':
        count++;
        break;
        case 'o':
        count++;
        break;
        case 'u':
        count++;
        break;
        case 'A':
        count++;
        break;
        case 'E':
        count++;
        break;
        case 'I':
        count++;
        break;
        case 'O':
        count++;
        break;
        case 'U':
        count++;
        break;
        
        default:
        count=-1;
    }
    }
    printf("%d",count);
    return 0;
}