N,M=map(int,input().split())
S=input()

LIST=[]

now=len(S)-1
for i in range(len(S)-1,-1,-1):
    if S[i]=="W":
        while S[now]!="A":
            now-=1

        if i<now:
            LIST.append(i)
            LIST.append(now)
            now-=1
        else:
            print("No")
            exit()

nozoku=set(LIST)

S2=[]
for i in range(len(S)):
    if i in nozoku:
        continue
    else:
        S2.append(S[i])

S=S2
now=len(S)-1
for i in range(len(S)-1,-1,-1):
    if S[i]=="A":
        while S[now]!="C":
            now-=1

        if i<now:
            now-=1
        else:
            print("No")
            exit()

print("Yes")