#include <iostream>
#include <string>
#include <cmath>
using namespace std;

int main(){
   int length = 0;
   string s;
   cin >> s;
   for(int i = 0;i < s.size();i++){
      if(s[i] == 'N' || s[i] == 'E') length++;
      else length--;
   }
   cout << sqrt(abs(length)) << endl;;
}