#include <iostream>
#include <cstring>

using namespace std;

char c[101];

int main(  )
{
    cin >> c;
    //Yardi
    for( int i= 0; i<strlen( c )-5; ++i )
    {
        if( c[i]=='Y' && c[i+1]=='a' && c[i+2]=='r' && c[i+3]=='d' && c[i+4]=='i')
        {
            cout << "DA";
            return 0;
        }
    }
    cout << "NU";
    return 0;
}