/*
* * author: attacker
* * created: 01.03.2026 14:30:19
*/
#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include "algo/debug.h"
#else
#define debug(...) 42
#endif
#define mt_rng mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
int n, k;
string s;
cin >> n >> k >> s;
auto Solve = [&](auto&& self, int l, int r, int cc_1, int cc_2, bool which) -> bool {
if (cc_1 == k) {
return false;
}
if (cc_2 == k) {
return true;
}
if (l > r) {
return false;
}
if (which) {
bool low = self(self, l + 1, r, cc_1 + (s[l] == 'C'), cc_2, !which);
bool high = self(self, l, r - 1, cc_1 + (s[r] == 'C'), cc_2, !which);
return low || high;
} else {
bool low = self(self, l + 1, r, cc_1, cc_2 + (s[l] == 'C'), !which);
bool high = self(self, l, r - 1, cc_1, cc_2 + (s[r] == 'C'), !which);
return low && high;
}
};
cout << (Solve(Solve, 0, n - 1, 0, 0, true) ? "DA" : "NE") << '\n';
return 0;
}
