#!/usr/bin/env python3
import sys

fin = open(sys.argv[1], "r")
fout = open(sys.argv[2], "w")

for line in fin.readlines():
    line = line.strip()
    w = [line[i:i+2] for i in range(0, len(line), 2)]
    fout.write(f"{w[3]}{w[2]}{w[1]}{w[0]}\n")

fin.close()
fout.close()