#include <bits/stdc++.h>

using i64 = long long;

int main() {
  std::ios::sync_with_stdio(false);
  std::cin.tie(nullptr);

  int n, m, k;
  std::cin >> n >> m >> k;

  std::vector<bool> vis(n);
  for (int i = 0; i < k; i++) {
    int a;
    std::cin >> a;
    a--;
    vis[a] = true;
  }

  std::vector<std::vector<int>> adj(n);
  for (int i = 0; i < m; i++) {
    int u, v;
    std::cin >> u >> v;
    u--, v--;
    adj[u].push_back(v);
    adj[v].push_back(u);
  }

  int t = -1;
  for (int i = 0; i < n; i++) {
    if (!vis[i]) {
      t = i;
      break;
    }
  }

  if (t == -1) {
    std::cout << "NO\n";
    return 0;
  }

  std::vector<bool> ok(n);
  std::vector<std::vector<int>> ans;
  std::queue<int> q;
  q.push(t);
  ok[t] = true;
  while (!q.empty()) {
    int x = q.front();
    q.pop();
    std::vector<int> vec;
    for (auto y : adj[x]) {
      if (!ok[y]) {
        ok[y] = true;
        vec.push_back(y);
        if (!vis[y]) {
          q.push(y);
        }
      }
    }
    if (!vec.empty()) {
      vec.push_back(x);
      ans.push_back(vec);
    }
  }

  for (int i = 0; i < n; i++) {
    if (!ok[i]) {
      std::cout << "NO\n";
      return 0;
    }
  }

  std::cout << "YES\n";
  std::cout << ans.size() << "\n";

  for (auto x : ans) {
    std::cout << x.back() + 1 << " " << x.size() - 1 << " ";
    for (int j = 0; j < x.size() - 1; j++) {
      std::cout << x[j] + 1 << " ";
    }
    std::cout << "\n";
  }

  return 0;
}