#include <bits/stdc++.h>
using namespace std;
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#endif
using ll = long long;
using ld = long double;
using ull = unsigned long long;
#define endl "\n"
typedef pair<int, int> Pii;
#define REP(i, n) for (int i = 0; i < (n); ++i)
#define REP3(i, m, n) for (int i = (m); (i) < int(n); ++ (i))
#define rep(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define ALL(x) begin(x), end(x)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#define all(s) (s).begin(),(s).end()
#define drep2(i, m, n) for (int i = (m)-1; i >= (n); --i)
#define drep(i, n) drep2(i, n, 0)
#define rever(vec) reverse(vec.begin(), vec.end())
#define sor(vec) sort(vec.begin(), vec.end())
#define fi first
#define FOR_(n) for (ll _ = 0; (_) < (ll)(n); ++(_))
#define FOR(i, n) for (ll i = 0; (i) < (ll)(n); ++(i))
#define se second
#define pb push_back
#define P pair<ll,ll>
#define PQminll priority_queue<ll, vector<ll>, greater<ll>>
#define PQmaxll priority_queue<ll,vector<ll>,less<ll>>
#define PQminP priority_queue<P, vector<P>, greater<P>>
#define PQmaxP priority_queue<P,vector<P>,less<P>>
#define NP next_permutation
#define die(a) {cout<<a<<endl;return 0;}
#define dier(a) {return a;}
//const ll mod = 1000000009;
const ll mod = 998244353;
//const ll mod = 1000000007;
const ll inf = 4000000000000000000ll;
const ld eps = ld(0.00000000001);
static const long double pi = 3.141592653589793;
template<class T>void vcin(vector<T> &n){for(int i=0;i<int(n.size());i++) cin>>n[i];}
template<class T,class K>void vcin(vector<T> &n,vector<K> &m){for(int i=0;i<int(n.size());i++) cin>>n[i]>>m[i];}
template<class T>void vcout(vector<T> &n){for(int i=0;i<int(n.size());i++){cout<<n[i]<<" ";}cout<<endl;}
template<class T>void vcin(vector<vector<T>> &n){for(int i=0;i<int(n.size());i++){for(int j=0;j<int(n[i].size());j++){cin>>n[i][j];}}}
template<class T>void vcout(vector<vector<T>> &n){for(int i=0;i<int(n.size());i++){for(int j=0;j<int(n[i].size());j++){cout<<n[i][j]<<" ";}cout<<endl;}cout<<endl;}
void yes(bool a){cout<<(a?"yes":"no")<<endl;}
void YES(bool a){cout<<(a?"YES":"NO")<<endl;}
void Yes(bool a){cout<<(a?"Yes":"No")<<endl;}
void possible(bool a){ cout<<(a?"possible":"impossible")<<endl; }
void Possible(bool a){ cout<<(a?"Possible":"Impossible")<<endl; }
void POSSIBLE(bool a){ cout<<(a?"POSSIBLE":"IMPOSSIBLE")<<endl; }
#define FOR_R(i, n) for (ll i = (ll)(n)-1; (i) >= 0; --(i))
template<class T>auto min(const T& a){ return *min_element(all(a)); }
//template<class T>auto max(const T& a){ return *max_element(all(a)); }
template<class T,class F>void print(pair<T,F> a){cout<<a.fi<<" "<<a.se<<endl;}
template<class T>bool chmax(T &a,const T b) { if (a<b) { a=b; return 1; } return 0;}
template<class T>bool chmin(T &a,const T b) { if (b<a) { a=b; return 1; } return 0;}
template<class T> void ifmin(T t,T u){if(t>u){cout<<-1<<endl;}else{cout<<t<<endl;}}
template<class T> void ifmax(T t,T u){if(t>u){cout<<-1<<endl;}else{cout<<t<<endl;}}
ll fastgcd(ll u,ll v){ll shl=0;while(u&&v&&u!=v){bool eu=!(u&1);bool ev=!(v&1);if(eu&&ev){++shl;u>>=1;v>>=1;}else if(eu&&!ev){u>>=1;}else if(!eu&&ev){v>>=1;}else if(u>=v){u=(u-v)>>1;}else{ll tmp=u;u=(v-u)>>1;v=tmp;}}return !u?v<<shl:u<<shl;}
ll modPow(ll a, ll n, ll mod) { if(mod==1) return 0;ll ret = 1; ll p = a % mod; while (n) { if (n & 1) ret = ret * p % mod; p = p * p % mod; n >>= 1; } return ret; }
vector<ll> divisor(ll x){ vector<ll> ans; for(ll i = 1; i * i <= x; i++){ if(x % i == 0) {ans.push_back(i); if(i*i!=x){ ans.push_back(x / ans[i]);}}}sor(ans); return ans; }
ll pop(ll x){return __builtin_popcountll(x);}
ll poplong(ll x){ll y=-1;while(x){x/=2;y++;}return y;}
P hyou(P a){ll x=fastgcd(abs(a.fi),abs(a.se));a.fi/=x;a.se/=x;if(a.se<0){a.fi*=-1;a.se*=-1;}return a;}
P Pplus(P a,P b){ return hyou({a.fi*b.se+b.fi*a.se,a.se*b.se});}
P Ptimes(P a,ll b){ return hyou({a.fi*b,a.se});}
P Ptimes(P a,P b){ return hyou({a.fi*b.fi,a.se*b.se});}
P Pminus(P a,P b){ return hyou({a.fi*b.se-b.fi*a.se,a.se*b.se});}
P Pgyaku(P a){ return hyou({a.se,a.fi});}
 
void cincout(){
  ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
  cout<< fixed << setprecision(15);
}
vector<vector<ll>> solve(ll n,ll s,ll t,vector<vector<ll>> a){
  if(s==1) return a;
  vector<ll> used(n*s);
  vector<vector<P>> g(t);
  for(int i=0;i<n;i++){
    for(int j=0;j+1<s;j+=2){
      g[a[i][j]].pb({a[i][j+1],s*i+j});
      g[a[i][j+1]].pb({a[i][j],s*i+j});
    }
  }
 /* for(auto e:g){
    for(auto f:e) cerr<<f.fi<<" ";
    cerr<<endl;
  } */
  vector<ll> id(t);
  vector<ll> f(t);
  for(int i=0;i<t;i++) f[i]=g[i].size();
  vector<vector<ll>> p(n),q(n);
  auto dfs = [&](int v,auto& self) -> void {
   // cerr<<v<<endl;
   // for(auto e:id) cerr<<e<<" ";
   // cerr<<endl;
    while(id[v]<g[v].size()){
      if(used[g[v][id[v]].se]){
        id[v]++;
        continue;
      }
      ll u=g[v][id[v]].se,u2=g[v][id[v]].fi;
      f[v]--;
      f[g[v][id[v]].fi]--;
      p[u/s].pb(v);
      q[u/s].pb(g[v][id[v]].fi);
     // cout<<u/s<<" "<<v<<" "<<g[v][id[v]].fi<<endl;
      used[g[v][id[v]].se]=1;
      id[v]++;
      self(u2,self);
      return;
    }
  };
  for(int i=0;i<t;i++){
    if(f[i]%2){
      dfs(i,dfs);
      //cout<<"D"<<" "<<i<<endl;
    }
  }
  for(int i=0;i<t;i++){
    if(f[i]){
      dfs(i,dfs);
     // cout<<"E"<<endl;
    }
  }
  /*
  cerr<<"p"<<endl;
  for(auto e:p){
    for(auto f:e) cerr<<f<<" ";
    cerr<<endl;
  }
  cerr<<"q"<<endl;
  for(auto e:q){
    for(auto f:e) cerr<<f<<" ";
    cerr<<endl;
  }
  */
  auto x=solve(n,s/2,t,p),y=solve(n,s/2,t,q);
  vector<vector<ll>> r(n);
  for(int i=0;i<n;i++){
    for(auto e:x[i]) r[i].pb(e);
    for(auto e:y[i]) r[i].pb(e);
  }
  return r;
}
int main(){
  cincout();
  ll n,s,t;
  cin>>n>>s>>t;
  vector<vector<ll>> a(n);
  for(int i=0;i<n;i++){
    a[i].resize(s);
    for(int j=0;j<s;j++){
      cin>>a[i][j];
      a[i][j]--;
    }
  }
  vector<vector<ll>> r=solve(n,s,t,a);
  //for(auto &e:a) sor(e);
  for(auto e:r){
    for(auto f:e) cout<<f+1<<" ";
    cout<<endl;
  }
  /*
  for(int i=0;i<t;i++){
    vector<ll> v(s);
    for(int j=0;j<n;j++){
      for(int k=0;k<s;k++){
        if(r[j][k]==i) v[k]++;
      }
    }
    cout<<i<<" ";
    for(auto e:v) cout<<e<<" ";
    cout<<endl;
  }
  for(auto &e:r) sor(e);
  assert(a==r);*/
}