#include<iostream> using namespace std; int main(){ int a[105]; int n; cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; } if(n%2){ for(int i=1;i<n;i+=2){ int t=a[i]; a[i]=a[i+1]; a[i+1]=t; } } else{ for(int i=1;i<=n;i+=2){ int t=a[i]; a[i]=a[i+1]; a[i+1]=t; } } for(int i=1;i<=n;i++){ cout<<a[i]<<" "; } return 0; }