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

int count_vowels(char* str){
    int count=0;
    for(int i=0;str[i];i++){
        char c=tolower(str[i]);
        if(c=='a'||c=='e'||c=='i'||c=='0'||c=='u'){
            count++;
        }
    }
    return count;
}
int main(){
    char str[100];
    fgets(str,sizeof(str),stdin);
    str[strcspn(str,"\n")]='\0';
    int vowels=count_vowels(str);
    if(vowels!=-1)
    printf("Number of vowels:%d\n",vowels);
    return 0;
}