#include<iostream> using namespace std; int main(){ int a[1005],n,s; cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; } if(n%2==0){ for(int i=1;i<=n;i++){ cout<<a[i+1]<<" "<<a[i]<<" "; i++; } }else{ for(int i=1;i<=n-2;i++){ cout<<a[i+1]<<" "<<a[i]<<" "; i++; // 1 2 3 //2 1 3 2 3 } cout<<a[n]; } return 0; }