def union(x,y):
  rx=root(x)
  ry=root(y)
  if rx==ry:
    return
  if rx>ry:
    rx,ry=ry,rx
  r[ry]=rx
  return

def root(x):
  p=x
  l=[p]
  while r[p]!=p:
    p=r[p]
    l.append(p)
  for p in l:
    r[p]=l[-1]
  return r[x]

M=998244353
n,m=map(int,input().split())
a=list(map(int,input().split()))
r=list(range(n))

for i in range(m):
  u,v=map(int,input().split())
  u-=1
  v-=1
  union(u,v)

g=[0]*n
for i in range(n):
  ri=root(i)
  g[ri]+=a[i]
  g[ri]%=M

b=1
for i in range(n):
  ri=root(i)
  b*=g[ri]
  b%=M

print(b)