use std::collections::VecDeque;

use proconio::{input, marker::Usize1};

fn main() {
    input! {
        n: usize, m: usize,
        edges: [(Usize1, Usize1); m],
        k: usize,
        a: [Usize1; k],
    }

    let mut yiwiy9 = vec![false; n];
    for &a in &a {
        yiwiy9[a] = true;
    }

    let mut graph = vec![vec![]; n];
    for &(u, v) in &edges {
        graph[u].push(v);
        graph[v].push(u);
    }

    let mut dist = vec![[!0usize; 5]; n];
    dist[0][0] = 0;
    let mut que = VecDeque::from([(0, 0)]);

    while let Some((v, cnt)) = que.pop_front() {
        for &u in &graph[v] {
            let ncnt = if yiwiy9[u] { cnt + 1 } else { 0 };
            if ncnt == 5 {
                continue;
            }
            if dist[u][ncnt] <= dist[v][cnt] + 1 {
                continue;
            }
            dist[u][ncnt] = dist[v][cnt] + 1;
            que.push_back((u, ncnt));
        }
    }

    let ans = dist[n - 1].iter().copied().min().unwrap();
    println!("{}", ans as isize);
}