D2 Contest -1 problem 3

#include <stdio.h>
#include <ctype.h>
int main() {
    char c;
    scanf("%c", &c);
    char lower_c = tolower(c);
    
    if (lower_c == 'a' ) {
        printf("Yes .\n");
    } else if (lower_c == 'e'){
        printf("Yes .\n");
    } else if (lower_c == 'i'){
        printf("Yes .\n");
    } else if (lower_c == 'o'){
        printf("Yes .\n");
    } else if (lower_c == 'u'){
        printf("Yes .\n");
    } else {
        printf("No .\n");
    }

    return 0;
}