#include <bits/stdc++.h>

using namespace std;

const int N = 400010;
char s[N];
bool used[N];
int c[N];
int w[N];
int pref[N];
int suf[N];

int main()
{
    int n, m;
    scanf("%d%d", &n, &m);
    scanf("%s", s);
    int all = n + n + m + m;

    for (int i = 0; i < all; i++)
    {
        c[i] = (s[i] == 'C' ? 1 : 0) + (i > 0 ? c[i - 1] : 0);
        pref[i] = (s[i] == 'A' ? 1 : 0) + (i > 0 ? pref[i - 1] : 0);
    }
    for (int i = all - 1; i >= 0; i--)
    {
        w[i] = (s[i] == 'W' ? 1 : 0) + (i + 1 < all ? w[i + 1] : 0);
        suf[i] = (s[i] == 'A' ? 1 : 0) + (i + 1 < all ? suf[i + 1] : 0);
    }

    bool ok = true;

    for (int i = 0; i < all; i++) ok &= pref[i] >= c[i] && suf[i] >= w[i];

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

    return 0;
}