#include<stdio.h>
int main()
{FILE *f1=fopen("tm.in","r"),*f2=fopen("tm.out","w");
 int T=0,a=0,b=0,c=0; char p=0;
 fscanf(f1,"%d",&T);
 fscanf(f1,"%c",&p);
 while(fscanf(f1,"%c",&p)!=EOF)
 {if(p=='\n')
  {if((a==b)||(b==c))
      fprintf(f2,"DA\n");
   else
      fprintf(f2,"NU\n");
   a=0;b=0;c=0;
  }
  if(p=='a')
	 a++;
  if(p=='b')
	 b++;
  if(p=='c')
	 c++;
 }
 if((a==b)||(b==c))
      fprintf(f2,"DA\n");
   else
      fprintf(f2,"NU\n");
 return 0;
}