// #ifdef __AVX2__ // #pragma GCC target "avx2" // #endif // #pragma GCC optimize "O3" // #pragma GCC optimize "unroll-loops" #include <bits/stdc++.h> // #include <ext/pb_ds/assoc_container.hpp> // #include <ext/pb_ds/tree_policy.hpp> // using namespace __gnu_pbds; using namespace std; #define int long long #define elif else if #define all(l) begin(l),end(l) #define rall(l) rbegin(l),rend(l) #define append push_back #define print(l) for(auto i:l) cout<<i<<' '; cout<<endl; #define pprint(a,b) cout<<a<<' '<<b<<endl; #define inp(l) for(auto &i:l) cin>>i; // #define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> #define pai make_pair #define endl "\n" #define pii pair<int,int> #define fi first #define se second #define vec vector // const int mod=998244353; const int mod1=998244353; const int mod=1e9+7; const int N=2e5+5; int cnt(int su,vec<int>&a){ map<int,int>d; int ans=0; for(auto i:a){ if(d[su-i]>0){ d[su-i]--; ans++; } else d[i]++; } return ans; } int iter=1,itera=1; void solve(){ int n,k; cin>>n>>k; vec<int>a(n+k); inp(a); // reverse(all(a)); for(int i=0;i<k;i++){ for(int j=n+k-1;(n+k)-j<=k+1;j--){ // cout<<a[i]+a[j]<<endl; if(cnt(a[i]+a[j],a)>=n/2){ vec<int>ans; int su=a[i]+a[j]; map<int,int>d; for(auto i:a){ if(d[su-i]>0){ ans.append(i); ans.append(su-i); d[su-i]--; if(ans.size()==n) break; } else d[i]++; } sort(all(ans)); print(ans) return; } } } } signed main(){ // freopen("","r",stdin); // freopen("","w",stdout); ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); cout<<fixed<<setprecision(20); // cin>>itera; for(iter=1;iter<=itera;iter++) solve(); }