S = input().strip()
N = len(S)
S = "0"+S
A = [0]*(N+1)
for i in range(1,N+1):
    if S[i]=="S":
        A[i] = A[i-1]+1
    else:
        A[i] = A[i-1]
ans = 0
for i in range(1,N+1):
    if i+2>N:break
    if S[i:i+3]=="ing":
        ans += A[i]
print(ans)