func main()
	var n: int :: cui@inputInt()
	var s: []char :: cui@inputStr()
	
	var ans: []int :: #[0]int
	for i(1, n - 1)
		if(s[i] = 'o' & s[i - 1] = 'x')
			do ans :~ [i + 1]
		end if
	end for
	do cui@print("\{^ans}\n")
	do cui@print("\{ans.join(" ")}\n")
end func