#include <iostream>
using namespace std;
/*
Declarăm și citim datele de intrare(“a” si “b”).
Declaram variabila “inverse” pe care o initializam cu zero.
 
Cu o structura repetitiva a cărei conditie de rulare 
verifica ca “b” să fie mai mare decat zero:
	Variabila inverse va lua valoarea lui invers + ultima cifra a lui “b”.
	Taiem ultima cifra din “b”.
 
Cu o structura decizionala verificăm dacă  variabila “inverse” este egala cu dublul variabilei “a”: 
In caz afirmativ, afisam “DA”, altfel afisam “NU”.
*/
 
const int TEN = 10;
 
int main() {
	int a, b;
	cin >> a >> b;
	int inverse = 0;
	while (b > 0) {
		inverse = inverse * TEN + b % TEN;
		b = b / TEN;
	}
	if (2 * a == inverse) {
		cout << "DA";
	} else {
		cout << "NU";
	}
	return 0;
}

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CgoKCjMwMCAxMDEgLSZndDsgTlUK

300 101 -> NU