#include <iostream>
using namespace std;
int main() {
int a, b;
cin >> a >> b;
if ((a != b && (a > 0 && b > 0))) {
cout << "DA";
} else if ((a == 0 && b > 0)) {
cout << b << a;
} else if (a == 0 && b == 0) {
cout << 0;
} else if ((a > 0 && b == 0) || (a == b)) {
cout << a << b;
}
return 0;
}
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