import time
import sys
t1=time.clock()

filein=open("in13_9.txt")
fileout=open("out_13_9.txt","w")
Compare=0
size=filein.readline()
a=filein.readline().rstrip("\n").split(",")
b=filein.readline().rstrip("\n").split(",")
a.reverse()
b.reverse()
def unique(k):
  for i in k:
     j=k.count(i)
   
     if(j>1):
         while i in k:
             
             k.remove(k[k.index(i)])
             j-=1
             if(j==1):
                 break
         
unique(a)
unique(b)
a.reverse()
b.reverse()
Compare=len(a)+len(b)

for i in b:
    a.append(i)
a.reverse()    
unique(a)    
a.reverse()
for i in a:
    if(i==a[len(a)-1]):
        break
    fileout.write(i+",")
    fileout.seek(fileout.tell())
    
fileout.write(a[len(a)-1])
fileout.write("\n")
mem=sys.getsizeof(unique)+7*sys.getsizeof(a)+2*sys.getsizeof(filein)
t2=time.clock()
fileout.write("Time:"+str(t2-t1)+"\n")
fileout.write("Compare:"+str(Compare)+"\n")
fileout.write("Mem:"+str(mem)+"\n")