#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,n) for(int i=0;i<int(n);i++)

int main(){
  int n,m;
  cin>>n>>m;
  string s;
  cin>>s;
  int ct=0;
  for(char c:s){
    if(c=='A') ct++;
    if(c=='C') ct--;
    if(ct<0){
      cout<<"No"<<endl;
      return 0;
    }
  }
  reverse(s.begin(),s.end());
  ct=0;
  for(char c:s){
    if(c=='A') ct++;
    if(c=='W') ct--;
    if(ct<0){
      cout<<"No"<<endl;
      return 0;
    }
  }
  cout<<"Yes"<<endl;
}