S = input()

ans = 0
n = len(S)
idx = 0
Scnt = 0
while idx < n:
    if S[idx] == 'S':
        Scnt += 1
        idx += 1
    elif idx <= n - 3 and S[idx:idx + 3] == 'ing':
        ans += Scnt
        idx += 3
    else:
        idx += 1
print(ans)