#include <bits/stdc++.h>
using namespace std;
#define int long long // a.k.a. TLE creator
#define all(x) x.begin(), x.end()
template<class A, class B> istream& operator >>(istream &o, pair<A, B> &x){return o >> x.first >> x.second;}
template<class A, class B> ostream& operator <<(ostream &o, pair<A, B> &x){return o << x.first << ' ' << x.second << ' ';}
void setIO(){ios::sync_with_stdio(false); cin.tie(0);}
const int INF = INT_MAX, MOD = 998244353, N = 1e5 + 2, K = __lg(N) + 1;
signed main(){
setIO();
int n, k;
string s;
cin >> n >> k >> s;
int l = 0, r = n - 1, cnt[2]{};
for(int i = 0; i < n; i++){
if(s[l] == 'P')l++;
else if(s[r] == 'P')r--;
else{
cnt[i & 1]++;
int left = 0, right = 0;
for(int j = l; j <= r; j++){
if(s[j] == 'P')break;
left++;
}
for(int j = r; j >= l; j--){
if(s[j] == 'P')break;
right++;
}
if(left % 2 == 0)l++;
else r--;
}
if(cnt[0] >= k || cnt[1] >= k)break;
}
cout << (cnt[0] < k ? "DA" : "NE");
}
