#55427: c++ - > 只管y就好
#include <bits/stdc++.h>
using namespace std;
int main(){
string s;
while(cin>>s){
int total=0,yee=0;
for(int i=0;i<s.size();i++){
if(s[i]=='y'){
total+=abs(i-yee);
yee+=3;
}
}
cout<<total<<endl;
}
return 0;
}