import collections
import sys
from itertools import accumulate, groupby, batched
from typing import List, Tuple

MOD = 998244353

int1 = lambda x: int(x) - 1
input = lambda: sys.stdin.readline().rstrip('\n')
ii = lambda: int(input())
vi = lambda: list(map(int, input().split()))
vi1 = lambda: list(map(int1, input().split()))


def dbg(*args, **kwargs):
    print(*(repr(arg) for arg in args), *(f'{k}: {repr(v)}' for k, v in kwargs.items()),
          sep='; ', file=sys.stderr, flush=True)


def main():
    n, m = vi()
    g = [[] for _ in range(n)]
    iwai = [False] * n
    for i in range(m):
        u, v = vi1()
        g[u].append(v)
        g[v].append(u)
    k = ii()
    a = vi1()
    for i in a:
        iwai[i] = True

    q = collections.deque()
    q.append((0, 0, 0))
    inq = [[False] * 5 for _ in range(n)]
    inq[0][0] = True

    while q:
        d, u, c = q.popleft()
        if u == n - 1:
            return d
        for v in g[u]:
            nd, nc = d + 1, c + 1 if iwai[v] else 0
            if nc == 5 or inq[v][nc]:
                continue
            q.append((nd, v, nc))
            inq[v][nc] = True

    return -1


def _start():
    if (ret := main()) is not None:
        print(*ret) if isinstance(ret, List) or isinstance(ret, Tuple) else print(ret)


if __name__ == '__main__':
    _start()