#include <bits/stdc++.h>

using namespace std;

const int N = 400010;
char s[N];
bool used[N];

int main()
{
    int n, m;
    scanf("%d%d", &n, &m);
    scanf("%s", s);
    deque<int> a, c;
    int all = n + n + m + m;
    for (int i = 0; i < all; i++)
    {
        if (s[i] == 'A')
            a.push_back(i);
        else if (s[i] == 'C')
            c.push_back(i);
    }
    bool ok = true;

    for (int i = 0; ok && i < all; i++)
    {
        if (used[i]) continue;
        char ch = s[i];
        if (ch == 'C')
        {
            ok = false;
            break;
        }
        if (ch == 'W')
        {
            if (a.empty())
            {
                ok = false;
                break;
            }
            int j = a.back();
            used[j] = true;
            a.pop_back();
            ok &= i < j;
        }
        else
        {
            if (c.empty())
            {
                ok = false;
                break;
            }
            int j = c.front();
            used[j] = true;
            c.pop_front();
            ok &= i < j;
        }
    }

    if (ok)
        printf("Yes\n");
    else
        printf("No\n");

    return 0;
}