def root(x):
    if P[x] < 0: return x
    P[x] = root(P[x])  # 経路圧縮
    return P[x]
def unite(x,y):
    x = root(x)
    y = root(y)
    if x == y: return
    if x > y: x,y = y,x
    P[x] += P[y]
    P[y] = x

def same(x,y):
    return root(x) == root(y)

def size(x):
    x = root(x)
    return -P[x]
MOD = 998244353
N,M = map(int,input().split())
A = list(map(int,input().split()))
UV = [list(map(int,input().split())) for _ in range(M)]
P = [-1] * N
for u,v in UV:
    unite(u-1,v-1)
from collections import defaultdict
dic = defaultdict(int)
for i,a in enumerate(A):
    dic[root(i)] += a
    dic[root(i)] %= MOD
ans = 1
for i in range(N):
    ans *= dic[root(i)]
    ans %= MOD
print(ans)