S=input()
p=0
n=len(S)
s=[0]*n

for i in range(n):
    if S[i]=="S":
        s[i]+=1

for i in range(1,n):
    s[i]+=s[i-1]

ans=0
for i in range(n-2):
    if S[i:i+3]=="ing":
        ans+=s[i]
print(ans)