#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstdlib>
#include<vector>
#include<map>
#include<queue>
#include<string>
#include<sstream>
#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++;
    else if( s[i] == 'S' ) y--;
    else if( s[i] == 'W' ) x--;
    else if( s[i] == 'E' ) x++;
  }
  printf("%.5lf", sqrt(x*x + y*y));

  return 0;
}