# Helpful for txid byte ordering weirdness.
from sys import stdin, stdout
from binascii import a2b_hex, b2a_hex
while True:
    stdout.write('> ')
    stdout.flush()
    line = stdin.readline()
    if not line:
        break
    stdout.write(b2a_hex(a2b_hex(line.strip())[::-1]) + '\n')