#include <fstream>
#include <iostream>
#define N 105
using namespace std;
ifstream fin(".in");
ofstream fout(".out");
///2825 -chenare
int a[N][N], n, m ;///declarearea unei matrice
int main()
{
    int i,j;

    ///citirea
    cin>>n>>m; /// n-nr de linii , m- nr de coloane
    for(i=1;i<=n;i++)
        for(j=1;j<=m;j++)
          cin>>a[i][j];
    int x;
    cin>>x;
    bool gasit=0;
   /**
   chenar exterior = linia 1+ linia n+ coloana 1+ coloana n
   */
   ///l1+ln
   for(j=1;j<=m;++j)
   {
       if(a[1][j]==x) gasit=1;///linia 1
       if(a[n][j]==x) gasit=1;///linia n
   }
   ///c1+cm
   for(i=2;i<n;++i)
   {
       if(a[i][1]==x) gasit=1; ///coloana 1;
       if(a[i][m]==x) gasit=1;///coloana m
   }
   if(gasit) cout<<"DA";
   else cout<<"NU";
   ///cout<<(gasit?"DA":"NU");
    return 0;
}