def op(x, y):
    return x+y
class UnionFind:
    def __init__(self, n, A, op):
        self.n = n
        self.parent_size = [-1]*n
        self.A = A[:]
        self.op = op
 
    def leader(self, a):
        if self.parent_size[a] < 0:
            return a
        self.parent_size[a] = self.leader(self.parent_size[a])
        return self.parent_size[a]
 
    def merge(self, a, b):
        x, y = self.leader(a), self.leader(b)
        if x == y:
            return 
        l, r = self.A[x], self.A[y]
        if abs(self.parent_size[x]) < abs(self.parent_size[y]):
            x, y = y, x
        self.parent_size[x] += self.parent_size[y]
        self.parent_size[y] = x
        self.A[x] = self.op(l, r)
        return 
    
    def __getitem__(self, n):
        return self.A[self.leader(n)]
    
    def update(self, n, a):
        self.A[self.leader(n)] = a
 
    def same(self, a, b):
        return self.leader(a) == self.leader(b)
 
    def size(self, a):
        return abs(self.parent_size[self.leader(a)])
 
    def groups(self):
        result = [[] for _ in range(self.n)]
        for i in range(self.n):
            result[self.leader(i)].append(i)
        return [r for r in result if r != []]

N, M = map(int, input().split())
A = list(map(int, input().split()))
edge = [list(map(int, input().split())) for _ in range(M)]

MOD = 998244353

UF = UnionFind(N, A, op)
for U, V in edge:
    UF.merge(U-1, V-1)

ans = 1
for i in range(N):
    ans *= UF[i]
    ans %= MOD

print(ans)