#include<iostream> using namespace std; int a[10005],b,c,d; int main(){ cin>>b; for(int i = 1;i<=b;i++){ cin>>a[i]; } d = a[b]; if(b%10 == 1){ b-=1; } for(int i = 1;i<=b;i+=2){ c = a[i]; a[i] = a[i+1]; a[i+1] = c; } for(int i = 1;i<=b-1;i+=1){ cout<<a[i]<<' '; } cout<<d; return 0; }