#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 i,a[1001]={0},n,m; cin>>n>>m; for(i=1;i<=n;i++){ cin>>a[i]; } for(i=1;i<=m/2;i++){ cout<<a[i]<<" "<<a[a[i]]<<" "; } return 90; }