#!/usr/bin/python

import fileinput

a = fileinput.FileInput()

def window_iterate(sequence, width=2, begin=0):
	while begin < len(sequence):
		result = sequence[begin:begin+width]

		while len(result) < width: result.append('')

		yield result
		begin += 1

for line in a:
	line = line.split()

	out = []
	for window in window_iterate(line):
		if window[0] in set(['a', 'an']):
			if any(window[1].startswith(vowel) for vowel in 'aeiou'):
				if window[0] != 'an':
					if raw_input('change article in %r? ' % ' '.join(window)).lower().startswith('y'):
						window[0] = 'an'
			else:
				if window[0] != 'a':
					if raw_input('change article in %r? ' % ' '.join(window)).lower().startswith('y'):
						window[0] = 'a'
		out.append(window[0])
	print(' '.join(out))