This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define rep(a,b,c) for(int a=b; a<c; a++)
#define pb push_back
using namespace std;
const int lim=5e5+5;
vector<int> ady[lim];
int main(){
	int n, m, k, u, v;
	cin>>n>>m;
	rep(i,0,m){
		cin>>u>>v;
		ady[u].pb(v);
	}
	cin>>k;
	rep(i,0,k){
		cin>>u>>v;
	}
	cout<<u<<endl;
}
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