sir_vale

#include <iostream>
using namespace std;

int main()
{
    unsigned long long v[1001],i,n,ma=1000000,p,ok=1;
    cin>>n;
    for(i=1;i<=n;i++)
    {
        cin>>v[i];
        if(v[i]<ma)
        {
            ma=v[i];
            p=i;
        }
    }
    if(p==1 || p==n)
    {
        cout<<"NU";
        return 0;
    }
    for(i=1;i<=p-1;i++)
        if(v[i]<=v[i+1])
            ok=0;
    for(i=p;i<=n-1;i++)
        if(v[i]>=v[i+1])
            ok=0;
    if(ok==1)
        cout<<"DA";
    else cout<<"NU";

    return 0;
}