#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 1e5 + 1;
vector<int> g[N + 1];
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
int n, m, query; cin >> n >> m >> query;
for (int i = 1; i <= m; i++) {
int u, v; cin >> u >> v;
g[v].push_back(u);
}
while (query--) {
int p, j, ans = -1; cin >> p >> j;
vector<bool> vis(n + 1, 1);
for (int i = 1; i <= j; i++) {
int x; cin >> x;
vis[x] = 0;
}
vector<int> dist(n + 1, 0);
queue<int> q;
q.push(p);
while (!q.empty()) {
int u = q.front(); q.pop();
for (auto v : g[u]) {
if (dist[u] + 1 > dist[v]) {
q.push(v);
dist[v] = dist[u] + 1;
}
}
if (vis[u]) ans = max(ans, dist[u]);
}
cout << ans << '\n';
}
}
