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

int main(){
  string s;
  cin >>s;
  int x=0,y=0;
  for(int i=0;i<=s.size();i++){
    if(s[i]=='N')y++;
    if(s[i]=='E')x++;
    if(s[i]=='W')x--;
    if(s[i]=='S')y--;
  }
  cout << (double)sqrt(x*x+y*y) << endl;
  return 0;
}