50132. Only Consonants

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

static inline int is_vowel(char c){
    return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u';
}

int main(){
    char ch;
    int cnt = 0;

    int flag = 1;
    char last;
    while((ch = getchar()) != EOF){
        if(ch > 'z' || ch < 'a' || is_vowel(ch)) continue;
        if(flag == 1){
            last = ch;
            flag = 0;
        }
        else{
            if(last < ch) cnt++;
            last = ch;
        }
    }
    printf("%d\n", cnt);
}