#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000

int main(){
	
	string s;
	cin>>s;
	
	double x=0.0,y=0.0;
	rep(i,s.size()){
		if(s[i]=='N')y+=1.0;
		if(s[i]=='S')y-=1.0;
		if(s[i]=='W')x+=1.0;
		if(s[i]=='E')x-=1.0;
	}
	
	cout<<fixed<<setprecision(10)<<hypot(x,y)<<endl;
	
	return 0;
}