#include <iostream>
using namespace std;
int n, a[110];
int main()
{
cin >> n;
for (int i = 1; i <= n; i ++) cin >> a[i];
int len = n;
if (n % 2 != 0) len --;
for (int i = 1; i < len; i += 2) swap(a[i], a[i + 1]);
for (int i = 1; i <= n; i ++) cout << a[i] << ' ';
return 0;
}