#include <iostream>
using namespace std;

const int TEN = 10;
const int HUNDRED = 100;
const int THOUSAND = 1000;

int main() {
	int a;
	cin >> a;
	if (a >= HUNDRED && a < THOUSAND) {
		if ((a % TEN == a / HUNDRED) && (a / HUNDRED == a / TEN % TEN)) {
			cout << "DA";
		} else {
			cout << "NU";
		}
	}
	return 0;
}