#!/usr/bin/python3
def main():
	greek_alphabet=set("αβγδεζηθικλμνξοπρστυφχψω")
	sentence=input("Dose protash: ")
	sentence=sentence.replace('ς','σ')
	letters_in_sentence=set([ch for ch in sentence if ch in greek_alphabet])
	if greek_alphabet.issubset(letters_in_sentence):
		print("Einai pantogramma!")
	else:
		print("Den einai pantogramma!")
		
		missing=greek_alphabet-letters_in_sentence
		print("Leipoun ta grammata:",''.join(sorted(missing)))	
if __name__=="__main__":
	main()