#include<bits/stdc++.h>
using namespace std;
#define int int64_t
#define pb push_back
using pii=pair<int,int>;
const int lim=2e5+100;
signed main(){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int n,q;
cin>>n;
int a[n],b[n];
for(int i=0;i<n;i++){
cin>>a[i]>>b[i];
a[i]--,b[i]--;
}
cin>>q;
int c[q];
for(int i=0;i<q;i++){
cin>>c[i];
c[i]--;
}
for(int cur:c){
int dp[n][n]{};
dp[a[cur]][b[cur]]=1;
queue<pii>pq;
pq.push({a[cur],b[cur]});
while(pq.size()){
auto[l,r]=pq.front();
pq.pop();
for(int j=l;j<=r;j++){
int L=min(l,a[j]),R=max(r,b[j]);
if(!dp[L][R]){
dp[L][R]=dp[l][r]+1;
pq.push({L,R});
}
}
}
if(dp[0][n-1])cout<<dp[0][n-1]<<'\n';
else cout<<"-1\n";
}
}
