#include <bits/stdc++.h> using namespace std; int main() { int a[10001],n; cin >>n; for (int i = 0; i < n; i++) { cin >> a[i]; } for (int i = 1; i < n ; i += 2) { int temp = a[i]; a[i] = a[i - 1]; a[i - 1] = temp; } for (int i = 0; i < n; i++) { cout<<a[i]<<" "; } return 0; }