INTERSECTION OF ARRAY.txt

#include<bits/stdc++.h>
using namespace std;

int main(){
	
	int n;cin>>n;
	int A[n+5];
	for(int i=1;i<=n;++i) cin>>A[i];
	int m;cin>>m;
	int B[m+5];
	for(int i=1;i<=m;++i) cin>>B[i];
	
	for(int i=n,j=m;j>0 and i>0;--i,--j){
		if(A[i]==B[j]) continue;
		cout<<A[i];
		break;
	}
	
	return 0;
}