max=0
MAX=''
lista_a=[]
lista_b=[]
lista_c=[]
male=[]
a_wyrazy=int(input())
 
for i in range(a_wyrazy):
	#print(i)
	linia_a=input()
	lista_a.append(linia_a)
#print(lista_a)
b_wyrazy=int(input())	
for i in range(b_wyrazy):
	#print(i)
	linia_b=input()
	lista_b.append(linia_b)
#print(lista_b)
for i in lista_a:
	for j in lista_b:
		lista_c.append(i+j)
		lista_c.append(j+i)
		male.append((i+j).lower())
		male.append((j+i).lower())
#print(lista_c)
 
for i,j in zip(male,lista_c):
	if i==(i[::-1]):
		if (len(j))>max:
			MAX=j
print (len(MAX))
if len(MAX)>0:
	print(MAX)

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