# include<iostream> using namespace std; int main(){ int a[100],i,n; cin>>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-1]; } return 0; }