#include<bits/stdc++.h> using namespace std; int main(){ int c=-2e9,AK[100]; int n; cin>>n; for(int i=0;i<=n-1;i++){ cin>>AK[i]; } if(n%2!=0){ for(int i=0;i<=n-2;i+=2){ cout<<AK[i+1]<<" "<<AK[i]<<" "; } cout<<AK[n-1]; }else{ for(int i=0;i<=n-2;i+=2){ cout<<AK[i+1]<<" "<<AK[i]<<" "; } } return 0; }