#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <ctype.h>
 
bool isVowel(char c) {
    return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u';
}
 
long long int countAndPrint(const char *str)
{
    long long int count = 0,i;
    int len = strlen(str);
    int start_index = -1;
    for(i=0;i<len;++i){
        char c = tolower(str[i]);
        if(isVowel(c)){
            if(start_index == -1) start_index = i;
        }else{
            start_index = -1;
        }
 
        if(start_index != -1) count += (long long int)(i - start_index + 1);
    }    
    return count;
}
 
 
int main()
{
    printf("Number of vowel only substrings: %lld\n", countAndPrint("aeixae"));
}

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