#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
template <class T>
using ord_set = tree<T, null_type, less<T>, rb_tree_tag,
tree_order_statistics_node_update>;
#define int long long
#define all(x) x.begin(), x.end()
#define chmin(a, b) a = min(a, b)
#define chmax(a, b) a = max(a, b)
#define len(a) ((int)a.size())
#ifdef LOCAL
#include "algo/debug.h"
#else
#define debug(...) 42
#endif
const int dx[] = {1, 0, -1, 0};
const int dy[] = {0, 1, 0, -1};
const int INF = 0x3f3f3f3f3f3f3f3f;
const int MAXN = 1e5 + 10;
const int ROOT = sqrt(MAXN) + 100;
vector<pair<int,int>> dp[MAXN];
vector<bool> used(MAXN);
vector<bool> cant(MAXN);
void solution() {
int n, m, q;
cin >> n >> m >> q;
vector<int> adj[n];
vector<int> value(n);
for(int i = 0; i < m; i++) {
int u, v;
cin >> u >> v;
u -= 1, v -= 1;
adj[u].emplace_back(v);
value[v] += 1;
}
queue<int> Q;
for(int i = 0; i < n; i++) {
if(!value[i]) Q.push(i);
}
vector<int> ord;
while(Q.size()) {
int u = Q.front(); Q.pop();
ord.emplace_back(u);
for(int v : adj[u]) {
value[v] -= 1;
if(!value[v]) Q.push(v);
}
}
int root = sqrt(n) + 100;
for(auto u : ord) {
vector<pair<int,int>> ndp;
dp[u].emplace_back(0, u);
sort(all(dp[u]), greater<>());
for(auto [l, v] : dp[u]) {
if(used[v]) continue;
used[v] = 1;
ndp.emplace_back(l, v);
}
dp[u] = ndp;
for(auto [l, v] : dp[u]) {
used[v] = 0;
}
while(len(dp[u]) > root) dp[u].pop_back();
for(auto v : adj[u]) {
for(auto [x, y] : dp[u]) {
dp[v].emplace_back(x + 1, y);
}
}
}
while(q--) {
int t, y;
cin >> t >> y;
t -= 1;
vector<int> c(y);
for(int i = 0; i < y; i++) {
cin >> c[i];
c[i] -= 1;
cant[c[i]] = 1;
}
if(y >= root) {
vector<int> ndp(n, -INF);
for(auto u : ord) {
if(!cant[u]) {
chmax(ndp[u], 0LL);
}
for(auto v : adj[u]) {
chmax(ndp[v], ndp[u] + 1);
}
}
cout << (ndp[t] == -INF ? -1LL : ndp[t]) << "\n";
}
else {
int ans = -1;
for(auto [l, u] : dp[t]) {
if(!cant[u]) {
ans = l;
break;
}
}
cout << ans << "\n";
}
for(int i = 0; i < y; i++) {
cant[c[i]] = 0;
}
}
}
/*
* LE O PROBLEMA ATE O FINAL
* LE OS SAMPLES, ENTENDE OS SAMPLES
* LE INPUT, LE OUTPUT
* LE OS CONSTRAINTS
*/
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int tt = 1;
while(tt--) {
solution();
}
return 0;
}
