from types import GeneratorType

def bootstrap(f, stack=[]):
    def wrappedfunc(*args, **kwargs):
        if stack:
            return f(*args, **kwargs)
        to = f(*args, **kwargs)
        while True:
            if type(to) is GeneratorType:
                stack.append(to)
                to = next(to)
            else:
                stack.pop()
                if not stack:
                    break
                to = stack[-1].send(to)
        return to
    return wrappedfunc

N = int(input())
A = list(map(int, input().split()))
G = [[] for _ in range(N)]
for _ in range(N-1):
    u, v = map(int, input().split())
    G[u-1].append(v-1)
    G[v-1].append(u-1)

MOD = 998244353
@bootstrap
def dfs(n, pre):
    ans = 0
    for i, v in enumerate(G[n]):
        if v != pre:
            dp[n][i] = yield dfs(v, n)
            ans += dp[n][i]
            ans %= MOD
    yield ((ans*A[n])%MOD+A[n])%MOD

dp = [[0]*len(G[i]) for i in range(N)]
dfs(0, -1)

def LRset(n):
    for i in range(1, len(G[n])):
        L[n][i] = (L[n][i-1]+dp[n][i-1])%MOD
    for i in reversed(range(len(G[n])-1)):
        R[n][i] = (R[n][i+1]+dp[n][i+1])%MOD

L = [[0]*len(G[i]) for i in range(N)]
R = [[0]*len(G[i]) for i in range(N)]
LRset(0)

@bootstrap
def rerooting(n, pre, no):
    visited[n] = True
    preno = 0
    for i in range(len(G[n])):
        if G[n][i] == pre:
            preno = i
            break
    dp[n][preno] = ((L[pre][no]+R[pre][no])*A[pre]%MOD+A[pre])%MOD
    LRset(n)
    for i in range(len(G[n])):
        if not visited[G[n][i]]:
            yield rerooting(G[n][i], n, i)
    yield

visited = [False]*N
visited[0] = True
for i in range(len(G[0])):
    if not visited[G[0][i]]:
        rerooting(G[0][i], 0, i)

ans = 0
for i, d in enumerate(dp):
    for n in d:
        ans += n*A[i]
        ans %= MOD

def inverse(n, d):
    return n * pow(d, -1, MOD) % MOD

print(inverse(ans, 2))