from bisect import *

S = input()

T = []
for i in range(len(S) - 2):
    if S[i: i + 3] == "ing":
        T.append(i)
        i += 2
ans = 0
for i in range(len(S)):
    if S[i] == 'S':
        ans += len(T) - bisect_left(T, i)

print(ans)