import java.io.BufferedReader
import java.io.InputStream
import java.io.InputStreamReader
import java.io.PrintWriter
import java.util.*

fun PrintWriter.solve(sc: FastScanner) {
    val s = sc.nextLine()
    val n = s.length
    val num_ing = Array(n) { 0 }
    for (i in n - 3 downTo 0) {
        if (s.substring(i..i + 2) == "ing") {
            num_ing[i]++
        }
        if (i < n - 1) {
            num_ing[i] += num_ing[i + 1]
        }
    }
    var ans = 0L
    for (i in 0 until n) {
        if (s[i] == 'S') {
            ans += num_ing[i]
        }
    }
    println(ans)
}

fun main() {
    val writer = PrintWriter(System.out, false)
    writer.solve(FastScanner(System.`in`))
    writer.flush()
}

class FastScanner(s: InputStream) {
    private var st = StringTokenizer("")
    private val br = BufferedReader(InputStreamReader(s))

    fun next(): String {
        while (!st.hasMoreTokens()) st = StringTokenizer(br.readLine())

        return st.nextToken()
    }

    fun nextInt() = next().toInt()
    fun nextLong() = next().toLong()
    fun nextLine() = br.readLine()
    fun nextDouble() = next().toDouble()
    fun ready() = br.ready()
}