#include <bits/stdc++.h> using namespace std; int a[1005]; int main () { int n; cin>>n; int o = 0; for(int i = 0;i<n;i++){ cin>>a[i]; } for(int i = 0;i<n-1;i+=2){ o = a[i]; a[i]=a[i+1]; a[i+1]=o; } for(int i = 0;i<n;i++){ cout<<a[i]<<" "; } return 0; }