from collections import defaultdict,deque
Mod=998244353
N,M=map(int,input().split())
A=list(map(int,input().split()))
G=defaultdict(list)
for i in range(M):
    u,v=map(int,input().split())
    G[u].append(v)
    G[v].append(u)
C=[0]*(N+1)
color_sum=[0]*(N+1)
T=1
c=1
while T<=N:
    que=deque([T])
    C[T]=c
    while len(que):
        p=que.popleft()
        for q in G[p]:
            if(C[q]==0):
                C[q]=C[p]
                que.append(q)
    while T<=N and C[T]!=0:
        T+=1
    c+=1
for i in range(1,N+1):
    color_sum[C[i]]+=A[i-1]
ans=1
# print(color_sum,C)
for i in range(1,N+1):
    ans*=color_sum[C[i]]
    ans%=Mod
print(ans)