#include<iostream>
using namespace std;
int main()
{
    int A[102][102],n,m,x,i,j,verificare=0;
cin>>n;
cin>>m;
    for(i=1;i<=n;i++)
        for(j=1;j<=m;j++)
            cin>>A[i][j];
    cin>>x;
    for(i=1;i<=n;i++)
        if((A[i][1]==x)||(A[i][m]==x))
            verificare=1;
    for(i=1;i<=m;i++)
        if((A[1][i]==x)||(A[n][i]==x))
            verificare=1;
    if(verificare!=0)
        cout<<"DA";
    else
        cout<<"NU";
    return 0;

}