#include<stdio.h>
#include<string.h>
#include<ctype.h>

int countVowels(char* str){
    int count=0;
    int isValid=1;
    
    for (int i=0;str[i] != '\0';i++){
        if (isdigit(str[i])||(!isalpha(str[i])&&!isalpha(str[i]))){
            isValid=0;
            break;
        }
        if(str[i]=='a'||str[i]=='e'||str[i]=='i'||str[i]=='o'||str[i]=='u'){
           ( str[i]=='A'||str[i]=='E'||str[i]=='I'||str[i]=='O'||str[i]=='U');              count++;
           
        }
        if(!isValid){
            printf("Invalid string\n");
            return -1;
        }
        return count;
}

int main(){
    charstr[100];
    fgets(str,sizeof(str),stdin);
    
    for(int i=0;str[i]!='\0';i++){
        if(str[i]=='\n'){
            str[i]='\0';
            break;
        }
    }
    int count=countVowels(str);
    if(count!=-1){
        printf("%d\n",count);
    }
    
    return 0;
}