import sys

from regex_to_nfa import to_nfa
from nfa_to_regex import to_regex
from parse_regex import parse, ParseError

def main():
	try:
		regex = parse(input('regex> '))

	except ParseError as err:
		print('%s: Error: %s' % (sys.argv[0], str(err)), file=sys.stderr)

	else:
		nfa = to_nfa(regex)
		regex_prime = to_regex(nfa)

		print(regex_prime)

if __name__ == '__main__':
	main()