#!/usr/bin/python3


def fwnhen(word):
	fwnhenta=["a","e","i","o","u","α","ε","ι","η","ο","υ","ω"]
	m=[]
	for letter in word:
		if letter in fwnhenta:
			m.append(letter)
	if len(m)==0:
		print("oxi fwnienta sthn leksh")
	else:
		print(m)

def main():
	x=input("word: ")
	fwnhen(x)

if __name__=="__main__":
	main()