#include <bits/stdc++.h>
using namespace std;

signed main(){
  string S; cin >> S;
  int x = 0, y = 0;
  for( int i = 0; i < S.size(); ++i ){
    if( S[ i ] == 'N' ) ++x;
    if( S[ i ] == 'W' ) --y;
    if( S[ i ] == 'E' ) ++y; 
    if( S[ i ] == 'S' ) --x;
  }
  cout << fixed << setprecision( 13 ) << sqrt( x * x + y * y ) << endl;
  return 0;
}