//#include <bits/stdc++.h>
#include <iostream>
#include <string>
#include <cmath>
#define INF 114514
using namespace std;

typedef pair<double,double> P;
typedef long long ll;


int main(void) {
	string s;
	cin >> s;
	int x,y;
	x = y = 0;
	for(int i=0;i<s.size();i++)
		if(s[i] == 'N')y++;
		else if(s[i] == 'E')x++;
		else if(s[i] == 'W')x--;
		else y--;
	printf("%.10f\n",sqrt(x*x+y*y));

}

//command ctrl 上下
//command D
//command caps G → '' ""