#include <iostream>
#include <list>
#include <vector>
#include <string>
#include <stdio.h>
#include <stdint.h>
using namespace std;

using uint = unsigned int;
using ll = long long;

#define CIN( LL , A ) LL A; cin >> A 
#define GETLINE( A ) string A; getline( cin , A ) 

int main()
{

  CIN( string , S );
  const uint& size = S.size();
  ll x = 0;
  ll y = 0;
  
  for( ll i = 0 ; i < size ; i++ ){

    const string s = S.substr( i , 1 );

    if( s == "N" ){

      y++;

    } else if( s == "E" ){

      x++;

    } else if( s == "W" ){

      x--;

    } else if( s == "S" ){

      y--;
      
    }

    
  }

  const ll R2 = ( x * x + y * y ) * 10000;

  for( ll r = 0 ; r <= R2 ; r++ ){

    if( r * r >= R2 ){

      const double d = r / 100.0;
      cout << d << endl;
      return 0;

    }

  }

  return 0;

}