S = gets.chomp

s_cnt = 0
ing_cnt = 0
ans = 0

S.each_char.with_index do |s, idx|
  if s == 'S'
    s_cnt += 1
  elsif idx >= 2 && S[idx - 2..idx] == 'ing'
    ing_cnt += 1
    ans += s_cnt
  end
end

puts ans