#include <stdio.h>

int main() {
    char str[100], *ptr;
    int vowels=0;
    printf("Enter a string: \n");
    scanf("%s",str);
    ptr=str;
    while(*ptr!='\0'){
        if(*ptr=='a'||*ptr=='e'||*ptr=='i'||*ptr=='o'||*ptr=='u'){
            vowels++;
        }
        ptr++;
    }
    printf("number of vowels : %d",vowels);
    return 0;
}