#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;
using ld=long double;
ld pie=3.141592653589793;
ll inf=155550555555555;
ll mod=1000000007;
int main(){
    ll n,m;
    cin >> n >> m;
    string s;
    cin >> s;
    ll c=0,a=0;
    for (ll i = 0; i < s.size(); i++)
    {
        if (s[i]=='A')
        {
            a+=1;
        }else if (s[i]=='C')
        {
            c+=1;
        }
        if (c>a)
        {
            cout << "No" << endl;
            return 0;
        }
    }
    a=0;
    ll w=0;
    reverse(s.begin(),s.end());
    for (ll i = 0; i < s.size(); i++)
    {
        if (s[i]=='W')
        {
            w+=1;
        }else if (s[i]=='A')
        {
            a+=1;
        }
        if (w>a)
        {
            cout << "No" << endl;
            return 0;
        }
    }
    cout << "Yes" << endl;
}