Buggy python submission (verdict: Runtime Error):
n,a,b=int(input()),list(map(int,input().split()))+[0],list(map(int,input().split()))+[0]
for i in range(n):
	a[n]^=a[i]
	b[n]^=b[i]
na,nb=sorted(a),sorted(b)
if na!=nb:
	print("-1")
	exit()
f=dict()
def find(x):
	if f[x]==x:
		return x
	else:
		f[x]=find(f[x])
		return f[x]
ans=0
for i in range(n):
	if a[i]!=b[i]:
		f[a[i]]=a[i]
f[a[n]]=a[n]
for i in range(n):
	if a[i]!=b[i]:
		ans+=1
		f[find(b[i])]=find(a[i])
for i,j in f:
	if i==j:
		ans+=1
print(ans-1)

Fixed submission:
n,a,b=int(input()),list(map(int,input().split()))+[0],list(map(int,input().split()))+[0]
for i in range(n):
	a[n]^=a[i]
	b[n]^=b[i]
na,nb=sorted(a),sorted(b)
if na!=nb:
	print("-1")
	exit()
f=dict()
def find(x):
	if f[x]==x:
		return x
	else:
		f[x]=find(f[x])
		return f[x]
ans=0
for i in range(n):
	if a[i]!=b[i]:
		f[a[i]]=a[i]
f[a[n]]=a[n]
for i in range(n):
	if a[i]!=b[i]:
		ans+=1
		f[find(b[i])]=find(a[i])
for i in f:
	if i==f[i]:
		ans+=1
print(ans-1)

Buggy python submission (verdict: Runtime Error):
n,a,b=int(input()),list(map(int,input().split()))+[0],list(map(int,input().split()))+[0]
for i in range(n):
	a[n]^=a[i]
	b[n]^=b[i]
na,nb=sorted(a),sorted(b)
if sum([na[i]!=nb[i] for i in range(n+1)]):
	print("-1")
	exit()
f=dict()
def find(x):
	if f[x]==x:
		return x
	else:
		f[x]=find(f[x])
		return f[x]
ans=0
for i in range(n):
	if a[i]!=b[i]:
		f[a[i]]=a[i]
f[a[n]]=a[n]
for i in range(n):
	if a[i]!=b[i]:
		ans+=1
		f[find(b[i])]=find(a[i])
for i,j in f:
	if i==j:
		ans+=1
print(ans-1)

Fixed submission:
n,a,b=int(input()),list(map(int,input().split()))+[0],list(map(int,input().split()))+[0]
for i in range(n):
	a[n]^=a[i]
	b[n]^=b[i]
na,nb=sorted(a),sorted(b)
if na!=nb:
	print("-1")
	exit()
f=dict()
def find(x):
	if f[x]==x:
		return x
	else:
		f[x]=find(f[x])
		return f[x]
ans=0
for i in range(n):
	if a[i]!=b[i]:
		f[a[i]]=a[i]
f[a[n]]=a[n]
for i in range(n):
	if a[i]!=b[i]:
		ans+=1
		f[find(b[i])]=find(a[i])
for i in f:
	if i==f[i]:
		ans+=1
print(ans-1)

Buggy python submission (verdict: Runtime Error):
n,a,b,ax,bx=int(input()),list(map(int,input().split()))+[0],list(map(int,input().split()))+[0],0,0
for i in range(n):
	a[n]^=a[i]
	b[n]^=b[i]
na,nb=a,b
a,b=sorted(a),sorted(b)
if sum([a[i]!=b[i] for i in range(n+1)]):
	print("-1")
	exit()
f=dict()
def find(x):
	if f[x]==x:
		return x
	else:
		f[x]=find(f[x])
		return f[x]
ans=0
for i in range(n):
	if na[i]!=nb[i]:
		f[na[i]]=na[i]
f[na[n]]=na[n]
for i in range(n):
	if na[i]!=nb[i]:
		ans+=1
		f[find(nb[i])]=find(na[i])
for i,j in f:
	if i==j:
		ans+=1
print(ans-1)

Fixed submission:
n,a,b=int(input()),list(map(int,input().split()))+[0],list(map(int,input().split()))+[0]
for i in range(n):
	a[n]^=a[i]
	b[n]^=b[i]
na,nb=sorted(a),sorted(b)
if na!=nb:
	print("-1")
	exit()
f=dict()
def find(x):
	if f[x]==x:
		return x
	else:
		f[x]=find(f[x])
		return f[x]
ans=0
for i in range(n):
	if a[i]!=b[i]:
		f[a[i]]=a[i]
f[a[n]]=a[n]
for i in range(n):
	if a[i]!=b[i]:
		ans+=1
		f[find(b[i])]=find(a[i])
for i in f:
	if i==f[i]:
		ans+=1
print(ans-1)

Buggy python submission (verdict: Runtime Error):
n,a,b,ax,bx=int(input()),list(map(int,input().split()))+[0],list(map(int,input().split()))+[0],0,0
na,nb=a,b
for i in range(n):
	a[n]^=a[i]
	b[n]^=b[i]
a,b=sorted(a),sorted(b)
if sum([a[i]!=b[i] for i in range(n+1)]):
	print("-1")
	exit()
f=dict()
def find(x):
	if f[x]==x:
		return x
	else:
		f[x]=find(f[x])
		return f[x]
ans=0
for i in range(n):
	if na[i]!=nb[i]:
		f[na[i]]=na[i]
f[a[n]]=a[n]
for i in range(n):
	if na[i]!=nb[i]:
		ans+=1
		f[find(nb[i])]=find(na[i])
for i,j in f:
	if i==j:
		ans+=1
print(ans-1)

Fixed submission:
n,a,b=int(input()),list(map(int,input().split()))+[0],list(map(int,input().split()))+[0]
for i in range(n):
	a[n]^=a[i]
	b[n]^=b[i]
na,nb=sorted(a),sorted(b)
if na!=nb:
	print("-1")
	exit()
f=dict()
def find(x):
	if f[x]==x:
		return x
	else:
		f[x]=find(f[x])
		return f[x]
ans=0
for i in range(n):
	if a[i]!=b[i]:
		f[a[i]]=a[i]
f[a[n]]=a[n]
for i in range(n):
	if a[i]!=b[i]:
		ans+=1
		f[find(b[i])]=find(a[i])
for i in f:
	if i==f[i]:
		ans+=1
print(ans-1)

Buggy python submission (verdict: Runtime Error):
n,a,b,ax,bx=int(input()),list(map(int,input().split()))+[0],list(map(int,input().split()))+[0],0,0
na,nb=a,b
for i in range(n):
	a[n]^=a[i]
	b[n]^=b[i]
a,b=sorted(a),sorted(b)
if sum([a[i]!=b[i] for i in range(n+1)]):
	print("-1")
	exit()
mp=dict()
ax,bx=0,0
f=[i for i in range(n+1)]
def find(x):
	if f[x]==x:
		return x
	else:
		return find(f[x])
for i in range(n+1):
	mp[a[i]]=i
frog=True
for i in range(n):
	if na[i]!=nb[i]:
		frog=False
		f[find(mp[nb[i]])]=find(mp[na[i]])
if frog:
	print("0")
	exit()
st=set()
for i in range(n+1):
	st.add(find(mp[a[i]]))
print(n+len(st)-1)

Fixed submission:
n,a,b=int(input()),list(map(int,input().split()))+[0],list(map(int,input().split()))+[0]
for i in range(n):
	a[n]^=a[i]
	b[n]^=b[i]
na,nb=sorted(a),sorted(b)
if na!=nb:
	print("-1")
	exit()
f=dict()
def find(x):
	if f[x]==x:
		return x
	else:
		f[x]=find(f[x])
		return f[x]
ans=0
for i in range(n):
	if a[i]!=b[i]:
		f[a[i]]=a[i]
f[a[n]]=a[n]
for i in range(n):
	if a[i]!=b[i]:
		ans+=1
		f[find(b[i])]=find(a[i])
for i in f:
	if i==f[i]:
		ans+=1
print(ans-1)