import sys

int1 = lambda x: int(x) - 1

# input = lambda: sys.stdin.buffer.readline()
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
i1 = lambda: int1(input())
mi = lambda: map(int, input().split())
mi1 = lambda: map(int1, input().split())
li = lambda: list(mi())
li1 = lambda: list(mi1())
lli = lambda n: [li() for _ in range(n)]

INF = float("inf")
# mod = int(1e9 + 7)
mod = 998244353

n, m = mi()
s = input()
w = [i for i in range((n + m) * 2) if s[i] == "W"]
a = [i for i in range((n + m) * 2) if s[i] == "A"]
c = [i for i in range((n + m) * 2) if s[i] == "C"]
for i in w[::-1]:
    if i > a[-1]:
        print("No")
        exit(0)
    a.pop()
for i in c[::-1]:
    if i < a[-1]:
        print("No")
        exit(0)
    a.pop()
print("Yes")