#include <iostream>
using namespace std;
int main() 
{
	int n,sum=0,sum1=0;
	cin>>n;
	int ar[n-2];
	for(int i=0;i<n-2;i++)
	{
		cin>>ar[i];
		sum+=ar[i];
	}
	sum1=((n)*(n+1))/2;
	int pivot=(sum1-sum)/2;
	int left=0,left1=0,right=0,right1=0;
	for(int i=1;i<=pivot;i++)
	{
		left^=i;
	}
	for(int i=pivot+1;i<=n;i++)
	{
		right^=i;
	}
	for(int i=0;i<n-2;i++)
	{
		if(pivot>=ar[i])
		left1^=ar[i];
		else
		right1^=ar[i];
	}
	cout<<(left^left1)<<" "<<(right^right1);
	return 0;
}

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MTEKMSAyIDMgNSA2IDcgOSAxMCAxMQ==

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