#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

enum
{
    BUFF_SIZE = 4,
    CHAR_SIZE = 8
};

int
main(int argc, char *argv[])
{
    unsigned char buff[BUFF_SIZE];
    int fd = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0600);

    int n;
    while (scanf("%d", &n) > 0) {
        buff[sizeof(buff) - 1] = (unsigned char)(n & 0x0000ff);
        buff[sizeof(buff) - 2] = (unsigned char)((n & 0x000f00) >> 8);
        buff[sizeof(buff) - 3] = (unsigned char)((n & 0x0ff000) >> 12);
        buff[sizeof(buff) - 4] = (unsigned char)((n & 0xf00000) >> 20);

        if (write(fd, buff, sizeof(buff)) == -1) {
            return 1;
        }
    }

    close(fd);
    return 0;
}