func main()
	var s: []char :: cui@input()
	var ans: bool :: true
	for i(0, ^s - 1)
		if((i % 2 = 0) $ bit8.xor((s[i] = ' ') $ bit8) = 0b8)
			do ans :: false
		end if
	end for
	do cui@print(ans ?("Yes\n", "No\n"))
end func