#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdbool.h>

int a[100000], *g[100000], d[100000], s[100000], x[100000];
bool l[100000];

int comp(const void *x, const void *y) {
    return a[*(const int *)x] - a[*(const int *)y];
}

int main() {
    int n, m;
    scanf("%d %d", &n, &m);

    for (int i = 0; i < n; ++i) {
        scanf("%d", &a[i]);

        g[i] = NULL;
        d[i] = 0;
        s[i] = i;
    }

    qsort(&s[0], n, sizeof(int), comp);

    for (int i = 0; i < m; ++i) {
        int u, v;
        scanf("%d %d", &u, &v);
        --u; --v;

        g[u] = realloc(g[u], sizeof(int) * (d[u] + 1));
        g[v] = realloc(g[v], sizeof(int) * (d[v] + 1));
        g[u][d[u]] = v;
        g[v][d[v]] = u;
        ++d[u]; ++d[v];
    }

    int k;
    scanf("%d", &k);

    while (k--) {
        int b;
        scanf("%d", &b);
        --b;

        l[b] = true;
    }

    int *last = &x[0];
    for (int i = 0; i < n; ++i) {
        int v = s[i];

        if (!l[v]) {
            continue;
        }

        *last++ = v;
        for (int j = 0; j < d[v]; ++j) {
            int u = g[v][j];
            if (a[v] < a[u]) {
                l[u] = !l[u];
            }
        }
    }

    printf("%ld\n", last - &x[0]);

    int *iter = &x[0];
    while (iter != last) {
        printf("%d\n", *iter++ + 1);
    }
}