9not10 50

#include <iostream>

using namespace std;
int main()
{
unsigned x,uc;
cin>>x;
uc=x%10;
x/=10;

while (x)
{
    if (x%10<uc)
    {
    cout<<"NU";
    break;
    }
    uc=x%10;
    x/=10;
}
if (!x)
    cout<<"DA"<<endl;

return 0;
}