#include <iostream>
#include <string>

int main() {
    int n, m;
    std::cin >> n >> m;
    std::string s;
    std::cin >> s;
    bool flag = true;
    for (int i = 0, count = 0; i < n + m; i++) {
        if (s[i] == 'A') {
            count++;
        } else if (s[i] == 'C') {
            count--;
        }
        if (count < 0) {
            flag = false;
        }
    }
    for (int i = n + m - 1, count = 0; i >= 0; i--) {
        if (s[i] == 'W') {
            count++;
        } else if (s[i] == 'C') {
            count--;
        }
        if (count < 0) {
            flag = false;
        }
    }

    if (flag) {
        std::cout << "Yes" << '\n';
    } else {
        std::cout << "No" << '\n';
    }
}