import re
numeral_rx = r'(?:zero|one|two|three|four|five|six|seven|eight|nine|ten|eleven|twelve|thirteen|fourteen|fifteen|sixteen|seventeen|eighteen|nineteen|twenty|thirty|forty|fifty|sixty|seventy|eighty|ninety|hundred|thousand|million|billion|trillion)'
sentences=["How much is twelve thousand three hundred four plus two hundred fifty six?",
"How much is twelve thousand three hundred and four divided by two hundred fifty-six?"]
pat_num = re.compile(r'\b{0}(?:(?:\s+(?:and\s+)?|-){0})*\b|\d+'.format(numeral_rx))
for sentence in sentences:
	print(re.findall(pat_num, sentence))

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