# include<iostream> # include<cstdio> using namespace std; int main(){ int n; cin>>n; int a[101]; 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; }