n,m = map(int,input().split())
A = list(map(int,input().split()))

ans = 1
mod = 998244353

e = [[] for i in range(n)]
for _ in range(m):
    u,v = [int(x)-1 for x in input().split()]
    e[u].append(v)
    e[v].append(u)

vis = [0]*n

for i in range(n):
    if vis[i]:
        continue
    nums = 0
    q = [i]
    vis[i] = 1
    size = 0
    while q:
        now = q.pop()
        nums += A[now]
        size += 1
        for nex in e[now]:
            if vis[nex]:
                continue
            vis[nex] = 1
            q.append(nex)

    ans *= pow(nums,size,mod)
    ans %= mod
print(ans)