from bisect import bisect_left

string = input()
S_s = []
ing_s = []
for i in range(len(string)):
    if string[i] == "S":
        S_s.append(i)
    elif string[i:i+3] == "ing":
        ing_s.append(i)
l = len(ing_s)
ans = 0
for s in S_s:
    ans += l - bisect_left(ing_s, s)
print(ans)