#include <bits/stdc++.h> using namespace std; int a[114514]; int n,m; signed main() { cin >> n >> m; for(int i = 1; i <= n*m; i++)cin >> a[i]; sort(a+1,a+(n*m)+1); for(int i = 1; i <= m; i++) { for(int j = 0; j < n; j++) { cout << a[i+(j*m)] << " "; } cout << endl; } return 0; }