#pragma GCC optimize("O3")
//#pragma GCC target("avx2")
//#pragma GCC optimize("unroll-loops")

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ld> vld;
typedef pair<ll,ll> Pll;
typedef pair<int,int> Pin;

ll INF = 1e16;
int inf = 1e9;

#define ALL(x) (x).begin(), (x).end()
#define FOR(i, m, n) for (ll i = (m); i < (n); ++i)
#define REVFOR(i, m, n) for (ll i = (n - 1); i >= (m); --i)
#define REP(i, n) FOR(i, 0, n)
#define REVREP(i, n) REVFOR(i, 0, n)
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define bcnt __builtin_popcountll

#ifdef LOCAL
#include <prettyprint.hpp>
#define debug(...)  cerr << "[" << #__VA_ARGS__ << "]: ", d_err(__VA_ARGS__);
#else
#define debug(...) 83;
#endif

void d_err() {
    cerr << endl;
}

template <typename H, typename... T>
void d_err(H h, T... t) {
    cerr << h << " ";
    d_err(t...);
}

template <typename T>
void print(T x) {
    cout << x << "\n";
}

template <typename T>
void print(vector<T>& x) {
    int N = x.size();
    REP(i, N) {
        if (i > 0) cout << " ";
        cout << x[i];
    }
    cout << "\n";
}

int main(){
    cin.tie(0);
    ios_base::sync_with_stdio(false);
    cout << fixed << setprecision(20);

    int n, m; cin >> n >> m;
    vll a(n); REP(i, n) cin >> a[i];

    vector<vi> edge(n);
    REP(i, m) {
        int u, v; cin >> u >> v;
        u--, v--;
        edge[u].eb(v);
        edge[v].eb(u);
    }

    vector<bool> s(n, false);
    int q; cin >> q;
    REP(i, q) {
        int b; cin >> b;
        s[b - 1] = true;
    }

    vector<pair<int, int>> aa;
    REP(i, n) aa.eb(a[i], i);

    sort(ALL(aa));

    vi ans;
    REP(i, aa.size()) {
        auto [v, j] = aa[i];
        if (s[j]) {
            ans.eb(j + 1);
            s[j] = false;
            for (auto &e: edge[j]) {
                if (a[e] > v) s[e] = s[e] ^ true;
            }
        }
    }

    print(ans.size());
    for(auto &e: ans) print(e);
}