import sys
input = sys.stdin.readline

def solve():
    N,M=map(int,input().split())
    S=list(input().strip())

    ok=[0]*len(S)
    r=len(ok)
    for i in range(len(S)-1,-1,-1):
        s=S[i]
        if s=="W":
            while r>0:
                r-=1
                if S[r]=="A":
                    if i<r:
                        ok[i]=1
                        ok[r]=1
                    break
    l=-1
    for i,s in enumerate(S):
        if s=="A" and ok[i]==0:
            while l<len(ok)-1:
                l+=1
                if S[l]=="C":
                    if i<l:
                        ok[i]=1
                        ok[l]=1
                    break
    print("Yes" if sum(ok)==len(ok) else "No")

solve()