zero_unu

#include <iostream>
using namespace std;
int main()
{
    int n, c, nr0, nr1;
    cin >> n;
    nr0 = nr1 = 0;
    while (n > 0 && n % 10 <= 1)
    {
        c = n % 10;
        if (c == 0) nr0++;
        else nr1++;
        n /= 10;
    }
    if (n == 0 && nr0 > 0 && nr1 > 0)
        cout << "da";
    else cout << "nu";
    return 0;
}