s=input()
f = [0]*len(s)
for i in range(len(s)-2):
    if s[i] == 'i' and s[i+1] == 'n' and s[i+2] == 'g':
        f[i] = 1

for i in range(len(s)-1):
    f[i+1] += f[i]

ans = 0
for i in range(len(s)):
    if s[i] == 'S':
        ans += f[-1]-f[i]

print(ans)