#include <bits/stdc++.h>
using namespace std;
const int maxn = 352;
int n, k;
int prefix_sum[maxn];
int dp[maxn][maxn][maxn];
int get_ans(int l, int r, int v){
int& res = dp[l][r][v];
if(res == -1){
int red = prefix_sum[n - 1];
int left = prefix_sum[r];
if(l) left -= prefix_sum[l - 1];
int other = red - left - v;
if(v >= k)
res = 0;
else if(other >= k)
res = 1;
else
if(!get_ans(l + 1, r, other) || !get_ans(l, r - 1, other))
res = 1;
else
res = 0;
}
return res;
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(NULL);
cin >> n >> k;
string str; cin >> str;
fill_n(&dp[0][0][0], 352 * 352 * 252, -1);
prefix_sum[0] = (str[0] == 'C');
for(int i = 1; i < n; i++)
prefix_sum[i] = prefix_sum[i - 1] + (str[i] == 'C');
if(get_ans(0, n -1, 0))
cout << "DA\n";
else
cout << "NE\n";
return 0;
}
