n=int(input())
a=input().split()
e=[[] for i in range(n)]
for i in range(n-1):
  u,v=map(int,input().split())
  u-=1
  v-=1
  e[u]+=[v]
  e[v]+=[u]
M=998244353
p10=[1]
for i in range(sum(len(v) for v in a)):
  p10+=[p10[-1]*10%M]
v=[0]*n
u=[0]*n
g1=[0]*n
q=[0]
while len(q)>0:
  s=q[-1]
  if v[s]==0:
    v[s]=1
    q+=[t for t in e[s] if v[t]==0]
  else:
    for t in e[s]:
      if v[t]==0:
        g1[s]+=g1[t]*p10[len(a[s])]+int(a[s])*u[t]
        g1[s]%=M
        u[s]+=u[t]
    g1[s]+=int(a[s])
    g1[s]%=M
    u[s]+=1
    v[s]=0
    q.pop()
g2=g1[:]
q=[0]
while len(q)>0:
  s=q[-1]
  if v[s]==0:
    v[s]=1
    for t in e[s]:
      if v[t]==0:
        g3=g2[s]
        g3-=g1[t]*p10[len(a[s])]+int(a[s])*u[t]
        g2[t]+=g3*p10[len(a[t])]+int(a[t])*(n-u[t])
        g2[t]%=M
        q+=[t]
  else:
    v[s]=0
    q.pop()
print(sum(g2)%M)