#include<bits/stdc++.h> using namespace std; int main(){ long long a[101]={0},x=0,n; cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; } if(n%2==0){ for(int i=1;i<=n;i+=2){ x=a[i]; a[i]=a[i+1]; a[i+1]=x; cout<<a[i]<<" "<<a[i+1]<<" "; } }else{ for(int i=1;i<=n-1;i+=2){ x=a[i]; a[i]=a[i+1]; a[i+1]=x; cout<<a[i]<<" "<<a[i+1]<<" "; } } cout<<a[n]; return 0; }