import re
""" import sys


for line in sys.stdin:
    stripped_line = line.strip()
    print(re.sub(r'(\D*\d+\D*)\d+', r'\1\2', stripped_line, count=1)) """


print(re.search(r'\d+ \d+', 'ala ma 41 41 kota'))
print(re.search(r' \d+ \d+', 'ala ma 41 123 kota'))
print(re.search(r' (\d+) \1', 'ala ma 41 41 kota'))
print(re.search(r' (\d+) \1', 'ala ma 41 123 kota'))