#技術室奥#5 Day2 で既出です。ごめんなさい　https://yukicoder.me/problems/no/1210

n, m = map(int, input().split())
x = 20
a = list(map(int, input().split()))
b = list(map(int, input().split()))
mod = 998244353
ax, bx = 0, 0
for i in range(n):
    ax ^= a[i]
for i in range(m):
    bx ^= b[i]
if ax != bx:
    print(0)
else:
    print(pow(pow(2, x, mod), (n - 1) * (m - 1), mod))