package _1159; import java.io.BufferedReader; import java.io.EOFException; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.io.UncheckedIOException; import java.lang.reflect.Array; import java.util.ArrayDeque; import java.util.Arrays; import java.util.Deque; import java.util.Objects; import java.util.regex.Matcher; import java.util.regex.Pattern; import java.util.stream.Collectors; public class Main { public void exec() { String s = stdin.nextString(); int n = s.length(); Pattern p = Pattern.compile("ing"); Matcher m = p.matcher(s); long[] a = new long[n+1]; while (m.find()) { a[m.start()]++; } for (int i = 0; i < n; i++) { a[i+1] += a[i]; } long ans = 0; for (int i = 0; i < n; i++) { if (s.charAt(i) == 'S') { ans += a[n] - a[i]; } } stdout.println(ans); } private static final Stdin stdin = new Stdin(); private static final Stdout stdout = new Stdout(); public static void main(String[] args) { try { new Main().exec(); } finally { stdout.flush(); } } public static class Stdin { private BufferedReader stdin; private Deque tokens; private Pattern delim; public Stdin() { stdin = new BufferedReader(new InputStreamReader(System.in)); tokens = new ArrayDeque<>(); delim = Pattern.compile(" "); } public String nextString() { try { if (tokens.isEmpty()) { String line = stdin.readLine(); if (line == null) { throw new UncheckedIOException(new EOFException()); } delim.splitAsStream(line).forEach(tokens::addLast); } return tokens.pollFirst(); } catch (IOException e) { throw new UncheckedIOException(e); } } public int nextInt() { return Integer.parseInt(nextString()); } public double nextDouble() { return Double.parseDouble(nextString()); } public long nextLong() { return Long.parseLong(nextString()); } public String[] nextStringArray(int n) { String[] a = new String[n]; for (int i = 0; i < n; i++) a[i] = nextString(); return a; } public int[] nextIntArray(int n) { int[] a = new int[n]; for (int i = 0; i < n; i++) a[i] = nextInt(); return a; } public double[] nextDoubleArray(int n) { double[] a = new double[n]; for (int i = 0; i < n; i++) a[i] = nextDouble(); return a; } public long[] nextLongArray(int n) { long[] a = new long[n]; for (int i = 0; i < n; i++) a[i] = nextLong(); return a; } } public static class Stdout { private PrintWriter stdout; public Stdout() { stdout = new PrintWriter(System.out, false); } public void printf(String format, Object ... args) { String line = String.format(format, args); if (line.endsWith(System.lineSeparator())) { stdout.print(line); } else { stdout.println(line); } } public void println(Object ... o) { String line = Arrays.stream(o).map(Objects::toString).collect(Collectors.joining(" ")); stdout.println(line); } public void debug(Object ... objs) { String line = Arrays.stream(objs).map(this::deepToString).collect(Collectors.joining(" ")); stdout.printf("DEBUG: %s%n", line); } private String deepToString(Object o) { if (o == null) { return "null"; } // 配列の場合 if (o.getClass().isArray()) { int len = Array.getLength(o); String[] tokens = new String[len]; for (int i = 0; i < len; i++) { tokens[i] = deepToString(Array.get(o, i)); } return "{" + String.join(",", tokens) + "}"; } return Objects.toString(o); } public void flush() { stdout.flush(); } } }