import sys; args = sys.argv[1:]

PATTERNS = [

# Q50: Match all words where some letter appears twice in the same word.
r'/(\w)+\w*\1\w*/i',

# Q51: Match all words where some letter appears four times in the same word.
r'/(\w)+(\w*\1){3}\w*/i',

# Q52: Match all non-empty binary strings with the same number of 01 substrings as 10 substrings.
r'/^1[10]*1$|^0[10]*0$/',

# Q53: Match all six letter words containing the substring cat.
r'/\b(?=\w*cat)\w{6}\b/',

# Q54: Match all 5 to 9 letter words containing both the substrings bri and ing.
r'/\b(?=\w*bri)(?=\w*ing)\w{5,9}\b/',

# Q55: Match all six letter words not containing the substring cat.
r'/\b(?!\w*cat)\w{6}\b/',

# Q56: Match all words with no repeated characters.
r'/\b((\w)(?!\w*\2))*\b/',

# Q57: Match all binary strings not containing the forbidden substring 10011.
r'/^(?!.*10011)[01]*$/',

# Q58: Match all words having two different adjacent vowels.
r'/\w*(a[eiou]|e[aiou]|i[aeou]|o[aeiu]|u[aeio])\w*/i',

# Q59: Match all binary strings containing neither 101 nor 111 as substrings.
r'/^(?!.*1.1)[01]*$/'

]

if len(args) != 0:
    idx = int(args[0])-50
    print(PATTERNS[idx])
else:
    with open('Umaretiya_r_U4_C.txt', 'w') as file:
        for pattern in PATTERNS:
            file.write(pattern + '\n')