#include <bits/stdc++.h>
using namespace std;
int main(){
    int n, m;
    string s;
    cin >> n >> m >> s;
    int len = 2 * (n + m);
    int w_cnt = 0;
    for(int i = 0; i < len; i++){
        if(s[i] == 'W'){
            w_cnt++;
        }else if(s[i] == 'A'){
            w_cnt = max(w_cnt - 1, 0);
        }
    }
    if(w_cnt > 0){
        cout << "No" << endl;
        return 0;
    }
    int c_cnt = 0;
    for(int i = len - 1; i >= 0; i--){
        if(s[i] == 'C'){
            c_cnt++;
        }else if(s[i] == 'A'){
            c_cnt = max(c_cnt - 1, 0);
        }
    }
    if(c_cnt > 0){
        cout << "No" << endl;
        return 0;
    }
    cout << "Yes" << endl;
    return 0;
}