#include <bits/stdc++.h>

using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, m;
    cin >> n >> m;
    string s;
    cin >> s;
    int cntW = 0, cntA = 0;
    vector<bool> used(2 * (n + m), true);
    for (int i = 2 * (n + m) - 1; i >= 0; i--) {
        if (s[i] == 'W') {
            cntW++;
            used[i] = false;
            if (cntW > cntA) {
                cout << "No" << '\n';
                return 0;
            }
        }
        if (s[i] == 'A') {
            cntA++;
            if (cntA <= n) {
                used[i] = false;
            }
        }
    }
    string t = "";
    for (int i = 0; i < 2 * (n + m); i++) {
        if (used[i]) {
            if (s[i] == 'A') {
                t += 'A';
            } else if (s[i] == 'C') {
                if (t.size() && t.back() == 'A') {
                    t.pop_back();
                } else {
                    t += 'C';
                }
            }
        }
    }
    cout << (t.size() ? "No" : "Yes") << '\n';
}