#include <iostream>
using namespace std;
int main() {
int a, b, c, x;
cin >> a >> b >> c >> x;
int a_cnt = 0;
int b_copy = 0;
int c_copy = x % 10;
while (x > 1) {
++a_cnt;
x /= 10;
cout << x;
}
if (c == c_copy && b == b_copy && a == a_cnt) {
cout << "DA";
} else {
cout <<"NU";
}
return 0;
}
/* Teste:
Valori minime
3 1 2 102 -> DA
1 3 2 123 -> NU
Valori maxime
9 9 9 900000009 -> DA
9 9 9 90000009 -> NU
9 8 7 987654321 -> NU
Numere cu toate cifrele egale
4 4 4 4444 -> DA
7 7 7 7777777 -> DA
8 8 8 888888 -> NU
Numere cu toate cifrele distincte
4 4 1 4321 -> DA
7 5 1 7451 -> NU
Numere cu doua cifre identice
4 8 8 8458 -> DA
5 5 6 59796 -> DA
Numere cu trei cifre identice
3 3 3 333 -> DA
4 6 8 6888 -> DA */
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