#include <bits/stdc++.h>
using namespace std;
const int nx = 1e5 + 5;
const int b = 317;
int n, m, q;
vector<int> adj[nx];
vector<pair<int,int>> path[nx];
int dp[nx];
bool ban[nx];
bool inList[nx];
int solve(int u) {
if (dp[u] != -1) return dp[u];
int ans = 0;
for (auto v : adj[u]) {
ans = max(ans, solve(v));
}
if (ban[u]) {
if (ans != 0) return dp[u] = ans + 1;
return dp[u] = ans;
}
return dp[u] = ans + 1;
}
void precompute_path(int u) {
if (!path[u].empty()) return;
vector<pair<int,int>> tmp;
for (auto v : adj[u]) {
precompute_path(v);
for (auto [dist, idx] : path[v]) {
tmp.emplace_back(dist + 1, idx);
}
}
path[u].emplace_back(0, u);
sort(tmp.begin(), tmp.end(), greater<pair<int,int>>());
int ct = 0;
for (auto [d, x] : tmp) {
if (inList[x]) continue;
path[u].emplace_back(d, x);
ct++;
inList[x] = 1;
if (ct >= b) break;
}
sort(path[u].begin(), path[u].end(), greater<pair<int,int>>());
for (auto [d, x] : path[u]) inList[x] = 0;
return;
}
int main() {
ios_base::sync_with_stdio(0), cin.tie(0);
cin >> n >> m >> q;
while (m--) {
int u, v;
cin >> u >> v;
adj[v].emplace_back(u);
}
for (int u = 1; u <= n; u++) {
precompute_path(u);
/*printf("%d : ", u);
for (auto [k, v] : path[u]) {
printf("(%d, %d) ", k, v);
}
printf("\n");*/
}
while (q--) {
int t, y;
cin >> t >> y;
if (y < b) {
vector<int> ban(y);
for (int i = 0; i < y; i++) cin >> ban[i];
int ans = -1;
for (auto [dist, start] : path[t]) {
auto it = lower_bound(ban.begin(), ban.end(), start);
//printf("%d ", *it);
if (it != ban.end() && *it == start) continue;
ans = dist;
break;
}
printf("%d\n", ans);
} else {
memset(dp, -1, sizeof dp);
memset(ban, 0, sizeof ban);
for (int i = 0; i < y; i++) {
int x; cin >> x;
ban[x] = 1;
}
printf("%d\n", solve(t) - 1);
}
}
}
/*
5 6 3
1 2
2 4
3 4
1 3
3 5
4 5
4 1 1
5 2 2 3
2 3 1 4 5
1
3
0
*/
