set1=list(map(str,input().split(',')))
set2=list(map(str,input().split(',')))
print('choice one option 1)add 2)remove 3)difference 4)intersection ')
n=int(input())
print('choice one 1)set1 2)set2')
p=int(input())
if(n==1):
    st=str(input())
    if(p==1):
        a=set(set1)
        a.add(st)
        print("set("+str(list(sorted(a)))+")")
    elif(p==2):
        a=set(set2)
        a.add(st)
        print("set("+str(list(sorted(a)))+")")
    else:
        print('invalid choice')
elif(n==2): 
    st=str(input())
    if(p==1):
        a=set(set1)
        a.remove(st)
        print("set("+str(list(sorted(a)))+")")
    elif(p==2):
        a=set(set2)
        a.remove(st)
        print("set("+str(list(sorted(a)))+")")
    else:
        print('invalid choice')
elif(n==3): 
    if(p==1):
        a=set(set1)
        b=set(set2)
        c=list(sorted(a.difference(b)))
        print("set("+str(c)+")")
    elif(p==2):
        a=set(set1)
        b=set(set2)
        c=list(sorted(b.difference(a)))
        print("set("+str(c)+")")
    else:
        print('invalid choice')
elif(n==4): 
    if(p==1):
        a=set(set1)
        b=set(set2)
        c=list(sorted(a.intersection(b)))
        print("set("+str(c)+")")
    elif(p==2):
        a=set(set1)
        b=set(set2)
        c=list(sorted(b.intersection(a)))
        print("set("+str(c)+")")
    else:
        print('invalid choice')