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

int main(int argc, char* argv[]) {
    setvbuf(stdout, NULL, _IONBF, 0);
    setvbuf(stdin, NULL, _IONBF, 0);
    
    char flag[] = "FLAG";
    for( size_t i = 0; i < strlen(flag); i++ ) {
        flag[i] = flag[i] ^ 0xbeef;
    }
    fputs(flag, stdout);
    
    return EXIT_SUCCESS;
}