def UncommonWords(A, B):

	
	count = {}
	
	
	for word in A.split():
		count[word] = count.get(word, 0) + 1
	
	
	for word in B.split():
		count[word] = count.get(word, 0) + 1

	
	return [word for word in count if count[word] == 1]


A = "Sikshapath"
B = "Best website Sikshapath"

print(UncommonWords(A, B))