#pragma GCC optimize("Ofast")
#pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define f0r(i, n) for (auto i = 0; i < (n); ++i)
#define fnr(i, n, k) for (auto i = (n); i < (k); ++i)
#define all(v) (v).begin(), (v).end()
#define pb push_back
#define F first
#define S second
#define ctn(x) cout << x << '\n'
#define forl(a, l) for (auto a : l)
#define ctl(l) for (auto &a : (l)) cout << a << ' '; cout << endl;
#define lb(v, x) (lower_bound(all(v), x) - begin(v))
#define ub(v, x) (upper_bound(all(v), x) - begin(v))
#define pq priority_queue
template <class T>
using V = vector<T>;
using ll = long long;
using vi = V<int>;
using vl = V<ll>;
using pi = pair<int, int>;
using ti = tuple<int, int, int>;
using Adj = V<vi>;
using vvi = V<vi>;
const int S = 300;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int n, m, q;
cin >> n >> m >> q;
Adj G(n);
int u, v;
f0r(i, m) {
cin >> u >> v;
G[v-1].pb(u-1);
}
V<V<pi>> tops(n);
f0r(i, n) {
tops[i].pb({0, i});
map<int, int> ds;
forl(v, G[i]) {
for (auto &[d, u]: tops[v]) {
if (d == -1) break;
ds[u] = max(ds[u], d+1);
}
}
for (auto &[u, d]: ds) tops[i].pb({d, u});
sort(all(tops[i]), greater<pi>());
while (tops[i].size() < S) tops[i].pb({-1, -1});
tops[i].resize(S);
}
f0r(i, q) {
int t, y, x;
cin >> t >> y;
--t;
if (y >= S) {
vi mx(n);
f0r(i, y) {
cin >> x;
mx[x-1] = -1e9;
}
for (int i = 0; i <= t; ++i) {
forl(v, G[i]) mx[i] = max(mx[i], 1 + mx[v]);
}
ctn(max(mx[t], -1));
} else {
set<int> block;
f0r(i, y) {
cin >> x;
block.insert(x-1);
}
for (auto &[d, u]: tops[t]) {
if (!block.count(u)) {
ctn(d);
break;
}
}
}
}
}
