#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;
}
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