#line 1 "codes/Libraries/Core.hpp"



#include <bits/stdc++.h>
using namespace std;

using ll = long long;
using ull = unsigned long long;

#define rep(i,n) for(int i=0; i<n; i++)
#define rrep(i,n,s) for (int i=s; i<n; i++)


#line 2 "codes/B.cpp"

vector<vector<ll>> solve(int n,int m,int k){
	vector ans(n,vector<ll>(n,-1));
	vector<ll> count(m,n*n/m);
	rep(i,n){
		rep(j,n){
			if(i%k*k+j%k<m){
				ans[i][j]=i%k*k+j%k+1;
				count[i%k*k+j%k]--;
			}
		}
	}
	int now=0;
	rep(i,n){
		rep(j,n){
			while(now<m&&count[now]==0)now++;
			if(ans[i][j]==-1){
				ans[i][j]=now+1;
				count[now]--;
			}
		}
	}
	return ans;
}

bool check(int n,int m,int k,vector<vector<ll>> answer){
	rep(i,n-k+1){
		rep(j,n-k+1){
			vector<bool> ok(m,false);
			int ng=m;
			rep(a,k){
				rep(b,k){
					if(!ok[answer[i+a][j+b]-1]){
						ng--;
						ok[answer[i+a][j+b]-1]=true;
					}
				}
			}
			if(ng>0)return false;
		}
	}
	return true;
}

int main(){
	ll n,m,k;
	cin>>n>>m>>k;
	auto ans=solve(n,m,k);
	rep(i,n){
		rep(j,n){
			if(j)cout<<" ";
			cout<<ans[i][j];
		}
		cout<<endl;
	}
	return 0;

	srand(54307);

	while(true){
		int n=rand()%99+1;
		int k;
		if(n>1)k=rand()%(n-1)+1;
		else k=1;
		vector<int> yaku;
		for(int i=1;i*i<=n&&i*i<=k;i++){
			if(n%i==0){
				yaku.push_back(i);
				if(i*i!=n&&n/i<=k)yaku.push_back(n/i);
			}
		}
		int m=yaku[rand()%yaku.size()];
		if(!check(n,m,k,solve(n,m,k))){
			cout<<format("{} {} {}",n,m,k)<<flush;
			return 0;
		}
	}
}