import sys, math
sys.set_int_max_str_digits(0)

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

# AC を貪欲に消す
stack = []

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

# WA を貪欲に消す
stack2 = []
for s in stack:
    if stack2 and stack2[-1] == 'W' and s == 'A':
        stack2.pop()
    else:
        stack2.append(s)

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