import sys
input = sys.stdin.readline

S = input()[:-1]
ing = [0]*len(S)

for i in range(len(S)-2):
    if S[i:i+3]=='ing':
        ing[i] = 1

acc = [0]

for ing_i in ing:
    acc.append(acc[-1]+ing_i)

ans = 0

for i in range(len(S)):
    if S[i]=='S':
        ans += acc[len(S)]-acc[i]

print(ans)