import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        
        int n = sc.nextInt();
        int m = sc.nextInt();
        char[] s = sc.next().toCharArray();
        
        int waCount = 0;
        int wCount = 0;
        boolean flag = false;
        for (int i = 0; i < s.length ; i++) {
            
            if(!flag && s[i] == 'W'){
                flag = true;
                continue;
            }
            if(flag && s[i] == 'W'){
                wCount++;
                continue;
            }
            if(flag && s[i] == 'A'){
                waCount++;
                flag = false;
                continue;
            }
             if(!flag && s[i] == 'A'){
                if(wCount > 0){
                    waCount++;
                }
                if(wCount > 0){
                    wCount--;
                }
                continue;
            }
            
        }
        
        int acCount = 0;
        int aCount = 0;
        flag = false;
        for (int i = 0; i < s.length ; i++) {
            
           if(!flag && s[i] == 'A'){
                flag = true;
                continue;
            }
            if(flag && s[i] == 'A'){
                aCount++;
                continue;
            }
            if(flag && s[i] == 'C'){
                acCount++;
                flag = false;
                continue;
            }
             if(!flag && s[i] == 'C'){
                if(aCount > 0){
                    acCount++;
                }
                if(aCount > 0){
                    aCount--;
                }
                continue;
             }
            
        }
        
        System.out.println((waCount + acCount == n + m && waCount == n && acCount == m) ? "Yes" : "No");
        
    }
}