#!/usr/bin/python3

def existing_vowels(text, lang='en'):
	text = text.lower()

	if lang == 'en':
		vowels='aeiou'
	elif lang == 'el':
		vowels='αεηιουω'
	else:
		print("Μη υποστηριζόμενη γλώσσα!")
		return []

	exist=[]
	for char in text:
		if char in vowels and char not in exist:
			exist.append(char)
	return exist

def main():
	text= input("Dwse alfarhthmhtiko: ")
	lang =input("Epelekse glwssa (en -> agglika, el -> ellhnika): ").lower()

	vowels = existing_vowels(text,lang)

	if vowels:
		print("Fwnhenta pou brethhkan:", vowels)
	else:
		print(f"To alfarhthmhtiko {text} den fainetai na exei fwnhenta!")

if __name__=="__main__":
	main()