#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss second
#define pp pop_back
#define ll long long
#define pb push_back
#define pq priority_queue
#define ls(v) (int)v.size()
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define wr cout << "------------------------" << endl
#define tt debug
const int N = 1e5 + 5;
int dist[N];
vector<int>g[N];
bool banned[N];
void dfs(int nd){
for(auto it:g[nd]){
if(dist[it] < dist[nd] + 1){
dist[it] = dist[nd] + 1;
dfs(it);
}
}
}
signed main(){
#ifdef parad0x
freopen("file.in","r",stdin);
#endif
#define print(...) 42
ios::sync_with_stdio(false);cin.tie(nullptr);
int n,m,q;
cin >> n >> m >> q;
for(int i = 1,a,b;i<=m;++i){
cin >> a >> b;
g[b].pb(a);
}
while(q--){
int x;
cin >> x;
fill(banned + 1,banned + 1 + n,false);
fill(dist + 1,dist + 1 + n,0);
dist[x] = 0;
dfs(x);
int lens;
cin >> lens;
for(int i = 1,a;i<=lens;++i){
cin >> a;
banned[a] = true;
}
int ans = 0;
for(int i = 1;i<=n;++i){
if(!banned[i]){
ans = max(ans,dist[i]);
}
}
cout << ans << endl;
}
return 0;
}
