Arc injection

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

int check(void) {
    char correct[8]="arc";
    char input[8];
    int ok=0;
    printf("password: ");
    gets(input);
    if(strcmp(input,correct)==0) {
        ok=1;
    }
    return ok;
}
int main(void) {
    int a=check();
    if(a) printf("Access granted\n");
    else printf("Access denied\n");
    return a?0:1;
}