func main()
	var s: []char :: cui@input()
	var ans: int :: 0
	var n: int :: 0
	for i(0, ^s - 1)
		if(s[i] = 'S')
			do n :+ 1
		end if
		if(i >= 2 & s.sub(i - 2, 3) = "ing")
			do ans :+ n
		end if
	end for
	do cui@print("\{ans}\n")
end func