alternant1

#include <iostream>
using namespace std;
long long n;

int alternant(long long nr)
{
    if(nr<10)
        return 1;
    while(nr>9)
    {
        if((nr%10)%2==((nr/10)%10)%2)
            return 0;
        nr/=10;
    }
    return 1;
}

int main()
{
    cin>>n;
    if(alternant(n))
        cout<<"da";
    else
        cout<<"nu";
    return 0;
}