// gcc ./checkin_pwn.c -o ./pwn
#include <stdio.h>
#include <stdlib.h>

void init() {
    setvbuf(stdin, 0LL, 2, 0LL);
    setvbuf(stdout, 0LL, 2, 0LL);
    setvbuf(stderr, 0LL, 2, 0LL);
}

int main () {
    init();
    long long key = 0xf61df61df61df61d;
    long long input;
    puts("Please input the key to login:");
    read(0, (char *) &input, 8);
    if(input == key) {
        system("/bin/sh");
    }
}