import re
s=re.sub(r'S','0',input())
s=re.sub(r'ing','1',s)
s=re.sub(r'[a-zA-Z]','',s)
l=list(map(int,list(s)))
a=c=0
for i in l:
	if i<1: a+=1
	else: c+=a
print(c)