#include <iostream>
#include<conio.h>
include <vector>
using namespace std;
int main() {
int n;
cin>>n;
int vector a(n);
for(int i=0;i<n;i++)
cin>>a[i];
if(a[n-1]==0)
cout<<"UP";
else if(a[n-1]==15)
cout<<"DOWN";
else if(n>1)
{
if(a[n-1]>a[n-2])
cout<<"UP";
if(a[n-1]<a[n-2])
cout<<"DOWN";
}
else
cout<<"-1";
return 0;
}
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