MOD = 998244353
N,M = map(int, input().split())
A = [0]+list(map(int, input().split()))
T = [0]+[[i,A[i]] for i in range(1,N+1)]
def rfind(x):
    if T[x][0]==x:
        return x
    T[x][0] = rfind(T[x][0])
    return T[x][0]
def runion(x,y):
    rx = rfind(x)
    ry = rfind(y)
    if rx==ry:
        return
    if T[rx][1]>=T[ry][1]:
        T[ry][0] = rx
        T[rx][1] += T[ry][1]
    else:
        T[rx][0] = ry
        T[ry][1] += T[rx][1]
for _ in range(M):
    u,v = map(int, input().split())
    runion(u,v)
ans = 1
for i in range(1,N+1):
    ri = rfind(i)
    ans = (ans*T[ri][1])%MOD
print(ans)