from sys import setrecursionlimit, stdin


def find(parent, i):
    t = parent[i]
    if t < 0:
        return i
    t = find(parent, t)
    parent[i] = t
    return t


def unite(parent, i, j):
    i = find(parent, i)
    j = find(parent, j)
    if i == j:
        return
    parent[j] += parent[i]
    parent[i] = j


def bit_add(bit, i, x):
    i += 1
    n = len(bit)
    while i <= n:
        bit[i - 1] += x
        i += i & -i


def bit_sum(bit, i):
    result = 0
    i += 1
    while i > 0:
        result += bit[i - 1]
        i -= i & -i
    return result


def query(bit, start, stop):
    if start == 0:
        return bit_sum(bit, stop - 1)
    else:
        return bit_sum(bit, stop - 1) - bit_sum(bit, start - 1)


readline = stdin.readline
setrecursionlimit(10 ** 6)

N, M = map(int, readline().split())
A = list(map(int, readline().split()))

a = sorted(set(A))
t = {}
for i in range(len(a)):
    t[a[i]] = i
for i in range(N):
    A[i] = t[A[i]]

parent = [-1] * N
for _ in range(M):
    u, v = map(lambda x: int(x) - 1, readline().split())
    unite(parent, u, v)

K = int(readline())
B = set(map(lambda x: int(x) - 1, readline().split()))

t = {}
for i in range(N):
    p = find(parent, i)
    t.setdefault(p, [])
    t[p].append((A[i], i))
for k in t:
    t[k] = sorted(t[k])

result = []
for k in t:
    bit = [0] * (N + 1)
    for a, i in t[k]:
        x = query(bit, 0, a)
        if i in B:
            x += 1
        if x % 2 == 1:
            result.append(i + 1)
            bit_add(bit, a, 1)
print(len(result))
print(*result, sep='\n')