#include <bits/stdc++.h>
using namespace std;
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n, k;
cin >> n >> k;
vector<char> a(n+1);
for(int i=1;i<=n;i++)
{
cin >> a[i];
}
vector<int> fi(n+1), se(n+2);
fi[0]=0;
se[n+1]=0;
for(int i=1;i<=n;i++)
{
if(a[i]=='C')
{
fi[i]=fi[i-1]+1;
}
else
{
fi[i]=0;
}
}
for(int i=n;i>=1;i--)
{
if(a[i]=='C')
{
se[i]=se[i+1]+1;
}
else
{
se[i]=0;
}
}
int temp=0, l=1, r=n, ka=0, kb=0;
while(l<=r)
{
temp++;
if(a[l]=='P')
{
l++;
continue;
}
else if(a[r]=='P')
{
r--;
continue;
}
if(temp%2==1)
{
ka++;
}
else
{
kb++;
}
if(ka>=k)
{
cout << "NE" << "\n";
return 0;
}
else if(kb>=k)
{
cout << "DA" << "\n";
return 0;
}
if(se[l]>=fi[r])
{
l++;
}
else
{
r--;
}
}
cout << "DA" << "\n";
}
