import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")

#######################################################################
n,m = na()
A = na()
B = na()
k = 30
sa = 0
sb = 0
for i in range(n):
    sa ^= A[i]
for j in range(m):
    sb ^= B[j]

if sa!=sb:
    print(0)
    exit()
mod = 998244353
print(pow(2**20,(n-1)*(m-1),mod))