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Implementation
Read one 32-bit hexadecimal value from stdin (e.g. "12345678").
Print its four bytes in little-endian order as two-digit lowercase hex separated by spaces, followed by a newline:
Input 12345678 -> Output "78 56 34 12"
Why This Matters
Byte-order bugs are a classic source of parser vulnerabilities, and every tool in this track — readelf, Wireshark, Ghidra — must get endianness right on every field. The ntohl/htonl functions that every network program calls exist purely because of the distinction you are practicing here.