#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int a[100],n=0,c=0; cin>>n; for(int i=1;i<=n;i++) cin>>a[i]; for(int i=1;i<=n-1;i+=2){ cout<<a[i+1]<<" "<<a[i]<<" "; } if(n%2!=0){ cout<<a[n]; } return 0; }