#include<iostream>
int main(){
  char c;
  long q=0,p=0,i=0;
  while(std::cin>>c){
    if(c=='S') p++;
    if(i<3&&"ing"[i]==c) i++;
    else i=c=='i';
    if(i==3) q+=p;
  }
  std::cout<<q;
}