#include <bits/stdc++.h>
#define rep(i,l,n) for(int i=l;i<n;i++)
#define rer(i,l,n) for(int i=l;i<=n;i++)
#define all(a) a.begin(),a.end()
#define o(a) cout<<a<<endl
using namespace std;
typedef long long lint;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int,int> pii;

int main(){
	string s;
	cin>>s;
	double x=0,y=0;
	rep(i,0,s.size()){
		if(s[i]=='N') y++;
		if(s[i]=='E') x++;
		if(s[i]=='W') x--;
		if(s[i]=='S') y--;
	}
	double ans;
	ans=sqrt(x*x+y*y);
	printf("%.6lf\n",ans);
}