2_mirror_words

import re

string = input()
valid_pairs = []
mirror_pairs = []
word_pairs = r"(@|#)(([A-Za-z]{3,})\1\1([A-Za-z]{3,}))\1"
valid_match = re.search(word_pairs, string)
if valid_match:
    match = re.findall(word_pairs, string)
    for m in match:
        valid_pairs.append(m[2])
        valid_pairs.append(m[3])
    print(f"{len(valid_pairs)//2} word pairs found!")
    for index in range(0, len(valid_pairs)-1, 2):
        if valid_pairs[index] == valid_pairs[index+1][::-1]:
            mirror_pairs.append(f"{valid_pairs[index]} <=> {valid_pairs[index+1]}")

else:
    print("No word pairs found!")
if mirror_pairs:
    print("The mirror words are:")
    print(", ".join(mirror_pairs))
else:
    print("No mirror words!")