import time
import sys
f1=open('in13_9.txt','r')
f2=open('out_9_13_9.txt','w')

n=int(f1.readline())
row=f1.readline()
lst=row.split(',')
a=[]
for i in range(n):
    a.append(int(lst[i]))

row=f1.readline()
lst=row.split(',')
b=[]
t=time.clock()
for i in range(n):
    b.append(int(lst[i]))
    
    
z=[]
for i in range(n):
    z.append(a[i])
    z.append(b[i])
for i in range(len(z)):
    x=z[i]
    j=i+1
    if x!=0:
        while j <= 2*n-1:
            if x==z[j]:
                z[j]=0
            j=j+1
            c=time.clock()

for i in range(len(z)):
    if z[i]!=0:
        print z[i]
        f2.write(str(z[i])+',')
f2.write("\nTime Taken="+str(c-t))
mem=sys.getsizeof(b)+sys.getsizeof(j)+sys.getsizeof(i)+sys.getsizeof(x)
f2.write("\nMemory Used="+str(mem))
f1.close()
f2.close()