#include <iostream>
using namespace std;
int main()
{
int n;
cin>>n;
int c = n, prev = -1, inv = 0, l=0;
while(c!=0)
{
inv = inv * 10 + c%10;
c/=10;
l++;
}
if(inv == n){
int prev=-1;
bool munte = true;
for(int i = 0; i < l/2+l%2&&munte; i++)
{
munte = (n%10>prev);
prev = n%10;
n/=10;
}
cout << (munte?"DA":"NU");
}
else cout << "NU";
}
