#include<iostream>
#include<cmath> //math
#include<cstdlib> //abs
using namespace std;
int main()
{
char a[100000]; //a
while(cin>>a)
{
int b=0,y=0;
for(int i=0;a[i]!=0;i++)
{
if(a[i]=='y')
{
b+=abs(i-y); //yee
y+=3;
}
}
cout<<b<<endl; //b
}
return 0; //end
}