#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
namespace my{
#define eb emplace_back
#define LL(...) ll __VA_ARGS__;lin(__VA_ARGS__)
#define FO(n) for(ll ij=n;ij-->0;)
#define FOR(i,...) for(auto[i,i##stop,i##step]=range(0,__VA_ARGS__);i<i##stop;i+=i##step)
#define fo(i,...) FO##__VA_OPT__(R)(i __VA_OPT__(,__VA_ARGS__))
#define fe(a,i,...) for(auto&&__VA_OPT__([)i __VA_OPT__(,__VA_ARGS__]):a)
#define single_testcase void solve();}int main(){my::io();my::solve();}namespace my{
void io(){cin.tie(nullptr)->sync_with_stdio(0);cout<<fixed<<setprecision(15);}
using ll=long long;
constexpr auto range(bool s,auto...a){array<ll,3>r{0,0,1};ll I=0;((r[I++]=a),...);if(!s&&I==1)swap(r[0],r[1]);r[0]-=s;return r;}
constexpr char newline=10;
constexpr char space=32;
bool amin(auto&a,const auto&b){return a>b?a=b,1:0;}
auto max(const auto&...a){return max(initializer_list<common_type_t<decltype(a)...>>{a...});}
auto min(const auto&...a){return min(initializer_list<common_type_t<decltype(a)...>>{a...});}

template<class A,class B>struct pair{
  A a;B b;
  pair()=default;
  pair(A a,B b):a(a),b(b){}
  pair(const std::pair<A,B>&p):a(p.first),b(p.second){}
  auto operator<=>(const pair&)const=default;
  pair operator+(const pair&p)const{return{a+p.a,b+p.b};}
  friend ostream&operator<<(ostream&o,const pair&p){return o<<p.a<<space<<p.b;}
};

template<class T,class U>ostream&operator<<(ostream&o,const std::pair<T,U>&p){return o<<p.first<<space<<p.second;}
template<class T>ostream&operator<<(ostream&o,const multiset<T>&s){fe(s,e)o<<e<<string(&e!=&*s.rbegin(),space);return o;}

template<class T>struct multiset:std::multiset<T>{
  multiset(const initializer_list<T>&a={}){fe(a,e)this->emplace(e);}
  multiset(const vector<T>&a){fe(a,e)this->emplace(e);}
};

template<class T>struct set:multiset<T>{
  using multiset<T>::multiset;
  template<class...A>auto emplace(A&&...a){
    T x(std::forward<A>(a)...);
    if(auto p=this->find(x);p!=this->end())return pair{p,0};
    return pair{multiset<T>::emplace(x),1};
  }
};

template<class V>concept vectorial=is_base_of_v<vector<typename V::value_type>,V>;
template<class T>struct vec_attr{using core_type=T;static constexpr int d=0;};
template<vectorial V>struct vec_attr<V>{using core_type=typename vec_attr<typename V::value_type>::core_type;static constexpr int d=vec_attr<typename V::value_type>::d+1;};
template<class T>using core_t=vec_attr<T>::core_type;
template<class V>istream&operator>>(istream&i,vector<V>&v){fe(v,e)i>>e;return i;}
template<class V>ostream&operator<<(ostream&o,const vector<V>&v){fe(v,e)o<<e<<string(&e!=&v.back(),vectorial<V>?newline:space);return o;}

template<class V>struct vec:vector<V>{
  using vector<V>::vector;
  vec(const vector<V>&v){vector<V>::operator=(v);}

  vec&operator^=(const vec&u){this->insert(this->end(),u.begin(),u.end());return*this;}
  vec operator^(const vec&u)const{return vec{*this}^=u;}
  vec&operator+=(const vec&u){vec&v=*this;fo(i,v.size())v[i]+=u[i];return v;}
  vec&operator-=(const vec&u){vec&v=*this;fo(i,v.size())v[i]-=u[i];return v;}
  vec operator+(const vec&u)const{return vec{*this}+=u;}
  vec operator-(const vec&u)const{return vec{*this}-=u;}
  vec&operator++(){fe(*this,e)++e;return*this;}
  vec&operator--(){fe(*this,e)--e;return*this;}
  vec operator-()const{vec v=*this;fe(v,e)e=-e;return v;}

  auto scan(const auto&f)const{pair<core_t<V>,bool>r{};fe(*this,e)if constexpr(!vectorial<V>)r.b?f(r.a,e),r:r={e,1};else if(auto s=e.scan(f);s.b)r.b?f(r.a,s.a),r:r=s;return r;}
  auto max()const{return scan([](auto&a,const auto&b){a<b?a=b:0;}).a;}
  auto min()const{return scan([](auto&a,const auto&b){a>b?a=b:0;;}).a;}

  auto decode(const string&b="a")const{conditional_t<vectorial<V>,vec<string>,string>r;fe(*this,e)if constexpr(vectorial<V>)r.eb(e.decode(b));else r+=size(b)==1?e+b[0]:b[e];return r;}
};

template<bool is_negative=false>struct infinity{
  template<integral T>constexpr operator T()const{return numeric_limits<T>::max()*(1-is_negative*2);}
  template<floating_point T>constexpr operator T()const{return static_cast<ll>(*this);}
  template<class T>constexpr bool operator==(T x)const{return static_cast<T>(*this)==x;}
  constexpr auto operator-()const{return infinity<!is_negative>();}
  template<class A,class B>constexpr operator pair<A,B>()const{return pair<A,B>{*this,*this};}
};
constexpr infinity oo;

void lin(auto&...a){(cin>>...>>a);}
auto sinen(const string&b="a"){string s;lin(s);vec<ll>r;fe(s,e)r.eb(b.size()==1?e-b[0]:b.find_first_of(e));return r;}
auto sinen(ll n,const string&b="a"){vec<vec<ll>>r;fo(n)r.eb(sinen(b));return r;}
template<char c=space>void pp(const auto&...a){ll n=sizeof...(a);((cout<<a<<string(--n>0,c)),...);cout<<newline;}

auto grid_group_by_manhattan_distance(ll H,ll W){
  vec<vec<pair<ll,ll>>>res(H+W-2);
  fo(d,H+W-2)fo(i,max(0,d-W+1),min(d,H-1)+1)res[d].eb(i,d-i);
  return res;
}

single_testcase
void solve(){
  LL(H,W);
  auto a=sinen(H);

  auto gg=grid_group_by_manhattan_distance(H,W);

  set<pair<ll,ll>>st{{0,0}};
  vec<ll>res{a[0][0]};
  fo(d,H+W-2){
    ll mi=oo;
    fe(st,x,y){
      for(auto[nx,ny]:initializer_list<pair<ll,ll>>{{x,y+1},{x+1,y}}){
        if(nx<0||ny<0||nx>=H||ny>=W)continue;
        amin(mi,a[nx][ny]);
      }
    }

    res.eb(mi);

    set<pair<ll,ll>>nst;
    fe(st,x,y){
      for(auto[nx,ny]:initializer_list<pair<ll,ll>>{{x,y+1},{x+1,y}}){
        if(nx<0||ny<0||nx>=H||ny>=W)continue;
        if(a[nx][ny]==mi)nst.emplace(nx,ny);
      }
    }
    swap(nst,st);
  }
  pp(res.decode());
}}