#include<bits/stdc++.h>
using namespace std;
class matching{
  public:
  vector< vector<int> > g;
  vector<int> pa;
  vector<int> pb;
  vector<int> was;
  int n, m;
  int res;
  int iter;
  matching(int _n, int _m) : n(_n), m(_m) {
    assert(0 <= n && 0 <= m);
    pa = vector<int>(n, -1);
    pb = vector<int>(m, -1);
    was = vector<int>(n, 0);
    g.resize(n);
    res = 0;
    iter = 0;
  }
  void add(int from, int to) {
    assert(0 <= from && from < n && 0 <= to && to < m);
    g[from].push_back(to);
  }
  bool dfs(int v) {
    was[v] = iter;
    for (int u : g[v]) {
      if (pb[u] == -1) {
        pa[v] = u;
        pb[u] = v;
        return true;
      }
    }
    for (int u : g[v]) {
      if (was[pb[u]] != iter && dfs(pb[u])) {
        pa[v] = u;
        pb[u] = v;
        return true;
      }
    }
    return false;
  }
  int solve() {
    while (true) {
      iter++;
      int add = 0;
      for (int i = 0; i < n; i++) {
        if (pa[i] == -1 && dfs(i)) {
          add++;
        }
      }
      if (add == 0) {
        break;
      }
      res += add;
    }
    return res;
  }
  int run_one(int v) {
    if (pa[v] != -1) {
      return 0;
    }
    iter++;
    return (int) dfs(v);
  }
};
int n,m;
int a[101][101];
int main(){
	ios::sync_with_stdio(false);
	cin >> n >> m;
	for(int i=1; i<=n ;i++){
		for(int j=1; j<=m ;j++){
			cin >> a[i][j];
		}
	}
	for(int i=1; i<=m ;i++){
		matching g(n+1,n+1);
		for(int j=i; j<=m ;j++){
			for(int k=1; k<=n ;k++){
				g.add(k,(a[k][j]-1)/m+1);
			}
		}
		if(g.solve()!=n) return 49;
		for(int k=1; k<=n ;k++){
			for(int j=i; j<=m ;j++){
				if(g.pa[k]==(a[k][j]-1)/m+1){
					swap(a[k][i],a[k][j]);
					break;
				}
			}
		}
	}
	for(int i=1; i<=n ;i++){
		for(int j=1; j<=m ;j++){
			cout << a[i][j] << ' ';
		}
		cout << '\n';
	}
	int t[101];
	for(int i=1; i<=m ;i++){
		for(int j=1; j<=n ;j++){
			t[j]=a[j][i];
		}
		sort(t+1,t+n+1);
		for(int j=1; j<=n ;j++){
			a[j][i]=t[j];
		}
	}
	for(int i=1; i<=n ;i++){
		for(int j=1; j<=m ;j++){
			cout << a[i][j] << ' ';
		}
		cout << '\n';
	}
}