#include<iostream> using namespace std; int main(){ int n,a[100],temp; cin>>n; for(int i=0;i <n;i++){ cin>>a[i]; } for(int i=0;i <n;i+=2){ if(i +1 <n){ temp = a[i]; a[i]= a[i +1]; a[i+1] = temp; } } for(int i =0;i < n-1; i++){ cout<<a[i]<<" "; } cout<<a[n-1]; return 0; }