#include <iostream>
#include <fstream>
using namespace std;

void numar(int x, int &nrp)
{
    nrp=0;
    for(int i=2; i<=x; i++)
    {
        int d=0;
        for(int j=2; j<i/2; j++)
            if(i%j==0)
                d++;
        if(d==0)
            nrp++;
    }
}
int main()
{
    int a,b,p1,p2;
    cin>>a;
    cin>>b;
    if(a>b)
    {
        int aux=a;
        a=b;
        b=a;
    }
    numar(a, p1);
    numar(b, p2);
    if(p2-p1)
        cout<<"DA";
    else
        cout<<"NU";
}