#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//INSERT ABOVE HERE
signed main(){
  Int x=0,y=0;
  string s;
  cin>>s;
  for(Int i=0;i<(Int)s.size();i++){
    if(s[i]=='N') y--;
    if(s[i]=='S') y++;
    if(s[i]=='E') x++;
    if(s[i]=='W') x--;
  }
  cout<<sqrt((double)x*x+y*y)<<endl;
  return 0;
}