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