#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
const int crit = 448;
int i,j,p,q,n,m,k,Q,queried[100006],t,y,ans,nom[100006],cnt;
vector <int> v[100006];
vector <int> big;
vector <int> small;
int prec[450][100006];
void calc(int u,int d)
{
prec[nom[i]][u]=max(prec[nom[i]][u],d);
for(auto j:v[u])
calc(j,d+1);
}
void dfs(int u,int d)
{
//cout<<u<<" ud "<<d<<endl;
if(prec[nom[u]][t]!=-1)
{
ans=max(ans,prec[nom[u]][t]+d);
return ;
}
if(nom[u]!=0)
return ;
if(u==t)
{
ans=max(ans,d);
return ;
}
for(auto j:v[u])
{
if(j<=t)dfs(j,d+1);
}
}
void add_big(int u)
{
nom[u]=++cnt;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
cin>>n>>m>>Q;
memset(prec,-1,sizeof(prec));
for(i=1;i<=m;i++)
{
cin>>p>>q;
v[p].push_back(q);
}
for(i=1;i<=n;i++)
{
if(v[i].size()>=crit)
{
add_big(i);
big.push_back(i);
calc(i,0);
}
else small.push_back(i);
}
int br = 0;
while(Q--)
{
cin>>t;
cin>>y;
br++;
for(i=1;i<=y;i++)
{
cin>>p;
queried[p] = br;
}
ans=-1;
for(auto i:big)
{
if(queried[i]!=br)
ans=max(ans,prec[i][t]);
}
for(auto i:small)
{
if(i>t)continue;
if(queried[i]!=br)
{
dfs(i,0);
}
}
cout<<ans<<endl;
}
return 0;
}
///queries can be sorted
