//  3 numere naturale, a, b și c, care respectă condiția a < b < c. 
// 0 ≤ a, b, c ≤ 100
#include <iostream>
using namespace std;
int main () {
    int a, b, c;
    cin >> a >> b >> c;
    // Verificam daca cel putin doua numere sunt egale.
    // Operatorul '||' (OR) verifica daca cel putin una dintre conditii este adevarata.
    if (a == b || a == c || b == c) {
        // Daca cel putin doua numere sunt egale, afisam "DA".
        cout << "DA";
    } else {
        // Altfel, afisam "NU".
        cout << "NU";
    }
    return 0;
}

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