#include<fstream.h>
unsigned long nr,i,inv,j,t,ok,x;
int main()
{
ifstream f("invers.in");
ofstream g("invers.out");
f>>t>>nr;
for(j=1;j<=t;j++)
{ok=0;
 for(x=1;x<nr&&ok==0;x++)
 {i=x;inv=0;
  if(i/10!=0)
   while(i!=0)
    {inv=inv*10+i%10;i=i/10;}
   else
    inv=i;
  if(nr==x+inv)
   ok=1;
 if(ok==1)
  g<<"Da";
 }
 if(ok==0)
  g<<"Nu";
}
f.close();g.close();
return 0;
}