#include <iostream>

using namespace std;

int main()
{
    int ZT,XY,n,i;
    cin>>n;
    for(i=1;i<=n;i++) {cin>>XY>>ZT;
    if(ZT==00 || XY==ZT || XY==(ZT%10)*10+ZT/10 || ZT/10==ZT%10+1==XY%10+2==XY%10+3 ||  ((XY*100+ZT)& (XY*100+ZT-1))==0) cout<<"DA";
    else cout<<"NU";}
    return 0;
}