import bisect
s = list(input())
n = len(s)

s1 = []
for i in range(n):
  if s[i] == "S":
    s1.append(i)

ing = []
for i in range(n-2):
  if s[i:i+3] == list("ing"):
    ing.append(i)

ans = 0
#print(s1,ing)
for i in ing:
  ans += bisect.bisect(s1,i)
print(ans)