#include <iostream>
#include <vector>
#include <algorithm>
#include <set>
#define endl '\n'
using namespace std;
const int MAXN = 1e3 + 10;
const int MAXM = 2e5 + 10;
const int MAXQ = 1e3 + 10;
int n, m, q;
vector < int > adj[MAXN];
int dp[MAXN];
int t[MAXN];
int k[MAXN];
bool busy[MAXN][MAXN];
void read()
{
cin >> n >> m >> q;
for(int i = 1; i <= m; i++)
{
int u, v;
cin >> u >> v;
adj[v].push_back(u);
}
for(int i = 1; i <= q; i++)
{
cin >> t[i] >> k[i];
for(int j = 0; j < k[i]; j++)
{
int s;
cin >> s;
busy[i][s] = true;
}
}
}
void process_queries()
{
for(int i = 1; i <= q; i++)
{
for(int j = 1; j <= n; j++)
{
dp[j] = 0;
}
for(int u = t[i]; u >= 1; u--)
{
for(int& v : adj[u])
{
dp[v] = max(dp[v], dp[u] + 1);
}
}
int ans = -1;
for(int j = 1; j <= t[i]; j++)
{
if(busy[i][j])
continue;
ans = max(ans, dp[j]);
}
cout << ans << endl;
}
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
read();
process_queries();
return 0;
}
