#include <stdio.h>

int main(void)
{
    int c;

    while ((c = getchar()) != EOF)
        printf(" %02x", c);
    return 0;
}

#include <stdio.h>
#include <ctype.h>

void dump(FILE *in)
{
    char buf[16];  int i, c, n = 0;

    if (!in) return;

    do {
        printf("%.8X:", 16 * n++);
        for (i = 0; i < 16 && (c = fgetc(in)) != EOF; i++)
            printf("%3.2X", c), buf[i] = isprint(c) ? c : '.';
        printf("%*s   %.*s\n", (16 - i) * 3, "", i, buf);
    } while (c != EOF);
}

int main(int argc, char **argv)
{
    if (argv[1]) dump(fopen(argv[1], "rb"));
    return 0;
}