#include <bits/stdc++.h>
using namespace std;
#define ll int
#define FORI(i, n) for(ll i = 0; i < n; i++)
#define FOR(i, n) for(ll i = 1; i <= n; i++)
typedef vector < ll > vl;
typedef set < ll > setl;
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define pll pair<ll, ll>
#define db double
#define nll cout << "\n"
#define nl "\n"
#define sync ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
ll poww(ll a, ll b){
ll res = 1;
while(b){
if(b & 1)res *= a;
a *= a;
b >>= 1;
}
return res;
}
const ll mod = 998244353;
const int sz = 350 + 23 ;
const long long imax = LLONG_MAX;
ll n, m, k, res, q, x, y;
ll a[sz];
string s;
ll dp[sz][sz];
ll f(ll l, ll r, ll c1 = 0, ll c2 = 0, bool turn = 1){
if(l > r || c1 == k || l == n || r == 0)return 0;
if(c2 == k)return 1;
if(~dp[l][r])return dp[l][r];
ll cse = 0;
if(turn){
cse |= f(l + 1, r, c1 + ((s[l] == 'C')), c2, !turn);
cse |= f(l, r - 1, c1 + (s[r] == 'C'), c2, !turn);
}
else{
cse = 1;
cse &= f(l + 1, r, c1, c2 + (s[l] == 'C'), !turn);
cse &= f(l, r - 1, c1, c2 + (s[r] == 'C'), !turn);
}
return dp[l][r] = cse;
}
void solve(){
cin >> n >> k;
FORI(i, n){
FORI(j, n)dp[i][j] = -1;
}
cin >> s;
s = s;
x = f(0, n - 1);
cout << (x ? "DA" : "NE");
}
//IOI rice hub
signed main(){
// freopen("input.txt","r",stdin);a
// freopen("output.txt","w",stdout);
sync;
ll t = 1;
// cin >> t;
while(t--){
solve();
}
}
