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