#############################################################

import sys
sys.setrecursionlimit(10**7)

from heapq import heappop,heappush
from collections import deque,defaultdict,Counter
from bisect import bisect_left, bisect_right
from itertools import product,combinations,permutations

ipt = sys.stdin.readline

def iin():
    return int(ipt())
def lmin():
    return list(map(int,ipt().split()))

class dsu:

    def __init__(self,n):
        self.N = n
        self.cnt=[1]*self.N
        self.root=list(range(self.N))
        self.components = self.N

    def unite(self,x,y):
        x=self.leader(x)
        y=self.leader(y)
        if x!=y:
            self.components -= 1
            if self.cnt[x]<self.cnt[y]:
                x,y=y,x
            self.cnt[x]+=self.cnt[y]
            self.root[y]=x
            return x
        return None

    def leader(self,x):
        if self.root[x]==x:
            return x
        self.root[x]=self.leader(self.root[x])
        return self.root[x]

MOD = 998244353
#############################################################

N,M = lmin()
A = lmin()
uf = dsu(N)
for _ in range(M):
    u,v = lmin()
    u,v = u-1,v-1
    uf.unite(u,v)

cnt = [0]*N
for i in range(N):
    l = uf.leader(i)
    cnt[l] += A[i]
    cnt[l] %= MOD

ans = 1
for i in range(N):
    ans *= cnt[uf.leader(i)]
    ans %= MOD

print(ans)