func main()
	var n: int :: cui@inputInt()
	var m: int :: cui@inputInt()
	var s: []char :: cui@input()
	
	var ans: bool :: true
	
	block
		var w: int :: 0
		var a: int :: 0
		var c: int :: 0
		
		for i(0, ^s - 1)
			switch(s[i])
			case 'W'
				do w :+ 1
			case 'A'
				do a :+ 1
			case 'C'
				do c :+ 1
				if(a < c)
					do ans :: false
					break i
				end if
				do a :- 1
				do c :- 1
			end switch
		end for
	end block
	
	block
		var w: int :: 0
		var a: int :: 0
		var c: int :: 0
		do s.reverse()
		
		for i(0, ^s - 1)
			switch(s[i])
			case 'C'
				do w :+ 1
			case 'A'
				do a :+ 1
			case 'W'
				do c :+ 1
				if(a < c)
					do ans :: false
					break i
				end if
				do a :- 1
				do c :- 1
			end switch
		end for
	end block
	
	do cui@print((ans ?("Yes", "No")) ~ "\n")
end func