#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pll pair<long long, long long>
#define pb push_back
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
const ll N = 3e5 + 100;
const ll inf = 1e18;
const ll mod = 1e9 + 7;
const ll block = 350;
ll n,m,q;
vector<ll>adj[N];
ll dp[N];
void to_thic_cau(){
cin >> n >> m >> q;
for(int i = 1; i <= m;i++){
ll u,v; cin >> u >> v;
adj[v].pb(u);
}
while(q--){
ll t, sz; cin >> t >> sz;
for(int i = 1; i <= n;i++) dp[i] = 0;
for(int i = 1; i <= sz;i++){
ll x; cin >> x;
dp[x] = -inf;
}
for(int i = 1; i <= n;i++) for(auto j : adj[i]) dp[i] = max(dp[i], dp[j] + 1);
cout << (dp[t] < 0 ? -1 : dp[t]) << '\n';
}
}
signed main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
ll tc = 1;
//cin >> tc;
while(tc--) to_thic_cau();
}
