#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ii pair<int, int>
#define fi first
#define se second
#define fo(i,a,b) for (int i = (a); i <= (b); ++i)
#define fd(i,a,b) for (int i = (a); i >= (b); --i)
#define all(x) x.begin(), x.end()
#define pb push_back
#define maxi(a,b) a=max(a,b)
#define mini(a,b) a=min(a,b)
#define er(x) cerr << #x << " = " << (x) << '\n'
#define siz(x) ((int)(x).size())
#define ve vector
#define _ << ' ' <<
const int N = 1e5+5, inf = 1e9+10, mod = 1e9+7, sq = 100;
int n, m, d[N], deg[N];
ve<int> g[N], rg[N];
ve<ii> res[N];
bool kk[N], vis[N];
ve<ii> mer(ve<ii> &a, ve<ii> b) {
fo(i,0,siz(b)-1) b[i].fi++;
ve<ii> c; c.reserve(min(siz(a)+siz(b),sq));
int i=0, j=0;
while (i<siz(a)||j<siz(b)) {
if (i==siz(a)) {
if (!vis[b[j].se]) c.pb(b[j]), vis[b[j].se]=1;
j++;
} else if (j==siz(b)) {
if (!vis[a[i].se]) c.pb(a[i]), vis[a[i].se]=1;
i++;
} else if (a[i].fi>b[j].fi) {
if (!vis[a[i].se]) c.pb(a[i]), vis[a[i].se]=1;
i++;
} else {
if (!vis[b[j].se]) c.pb(b[j]), vis[b[j].se]=1;
j++;
}
}
if (siz(c)>sq) c.resize(sq);
fo(i,0,siz(a)-1) vis[a[i].se]=0;
fo(i,0,siz(b)-1) vis[b[i].se]=0;
return c;
}
ve<int> topo;
void init() {
fo(i,1,n) res[i].pb({0,i});
queue<int> q;
fo(i,1,n) if (deg[i]==0) q.push(i);
while (q.size()) {
int u = q.front(); q.pop(); topo.pb(u);
for (int v:g[u]) {
deg[v]--;
if (deg[v]==0) q.push(v);
}
}
for (int u:topo) {
for (int v:g[u]) {
res[v]=mer(res[v],res[u]);
}
}
}
int brute(int to) {
fo(i,1,n) d[i]=-inf;
d[to]=0;
fd(i,n-1,0) {
int u=topo[i];
for (int v:rg[u]) {
maxi(d[v],d[u]+1);
}
}
int mx=-1;
fo(i,1,n) if (!kk[i]) maxi(mx,d[i]);
return mx;
}
void solve() {
int q;
cin >> n >> m >> q;
fo(i,1,m) {
int u, v; cin >> u >> v;
g[u].pb(v); rg[v].pb(u);
deg[v]++;
}
init();
while (q--) {
int tt, sz; cin >> tt >> sz;
ve<int> busy(sz);
fo(i,0,sz-1) cin >> busy[i], kk[busy[i]]=1;
if (sz<sq) {
int mx=-1;
for (auto &p : res[tt]) {
if (!kk[p.se]) {
maxi(mx,p.fi);
break;
}
}
cout << mx << '\n';
} else {
cout << brute(tt) << '\n';
}
fo(i,0,sz-1) kk[busy[i]]=0;
}
}
signed main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
if (fopen("a.inp","r")) {
freopen("a.inp","r",stdin);
freopen("a.out","w",stdout);
}
solve();
}
