# include<bits/stdc++.h> using namespace std; int arr[101]; int main(){ int n; cin>>n; for(int i=1;i<=n;i++){ cin>>arr[i]; } int b; if(n%2==0){ for(int j=1;j<=n-1;j=j+2){ b = arr[j]; arr[j] = arr[j+1]; arr[j+1] = b; } } else{ for(int j=1;j<=n-2;j=j+2){ b = arr[j]; arr[j] = arr[j+1]; arr[j+1] = b; } } for(int c=1;c<=n;c++){ cout<<arr[c]<<' '; } return 0; }