#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef unsigned long long int ull;
typedef long double ld;
#define REP(i,a,b) for(ll i=(ll) a; i<(ll) b; i++)
#define pb push_back
#define mp make_pair
#define pl pair<ll,ll>
#define ff first
#define ss second
#define whole(x) x.begin(),x.end()
#define DEBUG(i) cout<<"WAFFLES "<<i<<"<\n"
#define INF 1000000000000000000LL
#define EPS (0.00000000001L)
#define pi (3.141592653589793L)
#define VV(vvvv,NNNN,xxxx); REP(iiiii,0,NNNN) {vvvv.pb(xxxx);}
ll mod=1000000007LL;
template<class A=ll>
void Out(vector<A> a) {REP(i,0,a.size()) {cout<<a[i]<<" ";} cout<<endl;}
template<class A=ll>
void In(vector<A> &a, ll N) {A cur; REP(i,0,N) {cin>>cur; a.pb(cur);}}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cout.precision(20);
ll k, n;
cin >> n >> k;
bool dp[k+1][n][n];
string row;
cin >> row;
ll cs[n+1];
cs[0] = 0;
for(ll i = 0; i < n; ++i){
cs[i+1] = cs[i] + (row[i] == 'C');
}
ll totc = cs[n];
for(ll i = 0; i < n; ++i)for(ll j = 0; j < n; ++j){
dp[k][i][j] = false;
}
for(ll l = 0; l < n; ++l){
for(ll i = 0; i+l < n; ++i){
for(ll ki = 0; ki < k; ++ki){
ll otk = totc-(cs[i+l+1]-cs[i])-ki;
if(otk >= k){
dp[ki][i][i+l] = true;
}else{
if(!dp[otk][i+1][i+l] || !dp[otk][i][i+l-1]){
dp[ki][i][i+l] = true;
}else{
dp[ki][i][i+l] = false;
}
}
}
}
}
cout << (dp[0][0][n-1]?"DA\n":"NE\n");
return 0;
}
