#include <bits/stdc++.h>
using namespace std;
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
typedef modint998244353 mint;
#endif
typedef long long  ll;
typedef pair<int,int> pii; typedef pair<ll,ll> pll;
const int INF = 1e9; const long long LINF = 1e18;
const int MOD = 998244353; const int MOD1 = 1e9+7;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define all(x) x.begin(), x.end()
template<typename T> bool chmin(T& a, T b){if(a > b){a = b; return true;} return false;}
template<typename T> bool chmax(T& a, T b){if(a < b){a = b; return true;} return false;}
void yorn(bool ans){cout << (ans?"Yes":"No") << endl; return;}

// しばらくはsize_tをキャストに任せてみようかな
int main(){
    int n,m; cin >> n >> m;
    string s; cin >> s;
    int l = (n+m)*2;

    /*vector<int> w(l),c(l),a1(l),a2(l);
    if(s.at(0)=='C'||s.back()=='W'){cout << "No" << endl; return 0;}

    if(s.at(0)=='A') a1.at(0) = 1;
    if(s.back()=='A') a2.at(0) = 1;
    for(int i=1;i<l;i++){
        if(s.at(i)=='C') c.at(i)++;
        c.at(i) += c.at(i-1);
        if(s.at(i) =='A') a1.at(i)++;
        a1.at(i) += a1.at(i-1);
    }
    for(int i=l-2;i>=0;i--){
        if(s.at(i)=='W') w.at(i)++;
        w.at(i) += w.at(i+1);
        if(s.at(i) =='A') a2.at(i)++;
        a2.at(i) += a2.at(i+1);
    }
    rep(i,l) cout << a1.at(i) << ' '; cout << endl;
    rep(i,l) cout << c.at(i) << ' '; cout << endl;
    rep(i,l) cout << a2.at(i) << ' '; cout << endl;
    rep(i,l) cout << w.at(i) << ' '; cout << endl;
    rep(i,l){
        if(a1.at(i)-c.at(i)<0 || a2.at(i)-w.at(i)<0){
            cout << "No" << endl; return 0;
        }
    }
    cout << "Yes" << endl;*/

    set<int> a,w,c;
    rep(i,l){
        if(s.at(i)=='A') a.insert(i);
        if(s.at(i)=='W') w.insert(i);
        if(s.at(i)=='C') c.insert(i);
    }
    //bool ans = true;
    for(auto i:c){
        if(*begin(a)<i) a.erase(*begin(a));
        else{cout << "No" << endl; return 0;}
    }
    for(auto i:a){
        if(*begin(w)<i) w.erase(*begin(w));
        else{cout << "No" << endl; return 0;}
    }
    cout << "Yes" << endl;
}