#include<iostream> using namespace std; int main(){ int n,s=0,i; cin>>n; int a[101]; for(i=0;i<n;i+=1){ cin>>a[i]; } if(i%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[n-1]; } return 0; }