#include <iostream>
#include <fstream>

using namespace std;
ifstream fin("spirala.in");
ofstream fout("spirala.out");

long long v[101][101],a[10201];
int main()
{
   long long nrlin,nrcol,i,j,is,js,ij,jj,t,d,ok;
    fin>>nrlin>>nrcol;
    for(i=1;i<=nrlin;i++)
        for(j=1;j<=nrcol;j++)
            fin>>v[i][j];
    t=0;
    is=1;
    js=1;
    ij=nrlin;
    jj=nrcol;
    while(t<nrlin*nrcol)
    {
        for(j=js;j<=jj;j++)
        {
             if(t<nrlin*nrcol)
             {
                 t++;
            a[t]=v[is][j];
             }

        }
        for(i=is+1;i<=ij;i++)
        {
             if(t<nrlin*nrcol)
             {
                t++;
            a[t]=v[i][jj];
             }

        }
        for(j=jj-1;j>=js;j--)
        {
            if(t<nrlin*nrcol)
            {t++;
            a[t]=v[ij][j];
            }
        }
        for(i=ij-1;i>is;i--)
        {
             if(t<nrlin*nrcol)
             {
                  t++;
            a[t]=v[i][js];
             }

        }
        is++;
        js++;
        ij--;
        jj--;
    }
    d=a[1]-a[2];
    for(i=1;i<=t;i++)
        cout<<a[i]<<" ";
    ok=1;
    i=1;
    while(ok==1 && i<t)
    {
        if((a[i]-a[i+1])!=d)
            ok=0;
        i++;
    }
    i--;
    if(ok==1)
    {
        fout<<"DA"<<endl;
        fout<<a[t];
    }
    else
    {
        fout<<"NU"<<endl;
        fout<<a[i]<<" "<<a[i+1];
    }

    return 0;
}