#include <iostream>
using namespace std;
const int N = 110;

int n, a[N];

int main()
{
	cin >> n;
	for (int i = 1; i <= n ; i ++ )
	{
			cin >> a[i];
			if (i % 2 == 0) swap(a[i], a[i - 1]);
	}
	for (int i = 1; i <= n ; i ++ )
			cout << a[i] << ' ';
	return 0;
}