N, M = map(int, input().split())
S = list(input())
w, a, c = 0, 0, 0
for i in range(len(S)):
    if S[i] == "W":
        w += 1
    elif S[i] == "A":
        if w:
            w -= 1
if w:
    print("No")
    exit()
     
S.reverse()       
w, a, c = 0, 0, 0
for i in range(len(S)):
    if S[i] == "C":
        c += 1
    elif S[i] == "A":
        if c:
            c -= 1
if c:
    print("No")
    exit()
    
print("Yes")