n, m = map(int, input().split())
s = input()


stack = []
for char in s:
    if char == "C" and stack and stack[-1] == "A":
        stack.pop()
    else:
        stack.append(char)

stack2 = []
for char in stack:
    if char == "A" and stack2 and stack2[-1] == "W":
        stack2.pop()
    else:
        stack2.append(char)

if stack2:
    print("No")
else:
    print("Yes")