Mirror Words judge 100/100

# 02. Mirror Words , 03. Programming Fundamentals Final Exam Retake 100/100
# https://judge.softuni.org/Contests/Practice/Index/2307#1

import re

string_data = input()

pattern = r'(\@|\#)([A-Za-z]{3,})\1(\@|\#)([A-Za-z]{3,})\3'

hidden_pairs = re.finditer(pattern, string_data)
pairs_found = 0
valid_pairs = []

for pair in hidden_pairs:
    pairs_found += 1
    word1 = pair.group(2)
    word2 = pair.group(4)
    if word1 == word2[::-1]:
        valid_pairs.append(f'{word1} <=> {word2}')

if pairs_found > 0:
    print(f"{pairs_found} word pairs found!")
else:
    print('No word pairs found!')

if valid_pairs:
    print(f'The mirror words are:')
    print(f'{", ".join(valid_pairs)}')
else:
    print('No mirror words!')