(function (f, s)
	local n,d,t = f(s,"o"),#s,"%.13f\n"
	for i=1,#s do io.write(t:format(n/d*100)) if s:sub(i,i)=="o" then n=n-1 end d=d-1 end
end)(function (s, c)
	local r = 0
	for i=1,#s do if s:sub(i,i)==c then r=r+1 end end
	return r
end, io.stdin:read("*l"))