#include <iostream>
using namespace std;

int main()
{
    int n, m;
    string s;
    cin >> n >> m >> s;
    int l = (n + m) * 2;
    int a = 0;
    for (int i = 0; i < l; i++)
    {
        if (s[i] == 'A')
        {
            a++;
        }
        if (s[i] == 'C')
        {
            a--;
            if (a < 0)
            {
                cout << "No" << endl;
                return 0;
            }
        }
    }
    a = 0;
    for (int i = l - 1; i >= 0; i--)
    {
        if (s[i] == 'A')
        {
            a++;
        }
        if (s[i] == 'W')
        {
            a--;
            if (a < 0)
            {
                cout << "No" << endl;
                return 0;
            }
        }
    }
    cout << "Yes" << endl;
}