#include <stdio.h>
 
int main() {
    char str[4];  // รับ 3 ตัวอักษร + '\0'
    int count = 0;
 
    printf("ป้อนข้อความ 3 ตัวอักษร (a-z): ");
    scanf("%3s", str);
 
    // ตรวจสอบว่าเป็นตัวอักษรพิมพ์เล็กและนับสระ
    for (int i = 0; i < 3; i++) {
        if (str[i] < 'a' || str[i] > 'z') {
            printf("กรุณาป้อนเฉพาะ a-z เท่านั้น\n");
            return 1;
        }
 
        if (str[i] == 'a' || str[i] == 'e' || str[i] == 'i' ||
            str[i] == 'o' || str[i] == 'u') {
            count++;
        }
    }
 
    printf("จำนวนสระคือ: %d\n", count);
    return 0;
}
 

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