A = []
B = []
def ciag(A,B):
	C = []
	pomocnicza_lista = []
	for i in A:
		if A[i] in B:
			for j in  B:
				if B[j] == A[i]:
					B[i] += pomocnicza_lista
					if  not len(C) % 1 ==0 and not len(C) % len(C) == 0:
						A[i] += C
	return C