#include<iostream>
#include<string>
#include<string.h>
#include<algorithm>
#include<stdio.h>
#include<cmath>
#include<vector>
#include<utility>
#define FOR(i, a, b) for(int i=(a);i<=(b);i++)
#define RFOR(i, a, b) for(int i=(a);i>=(b);i--)
#define MOD 1000000007

using namespace std;


int main(void) {
	int n = 0, e = 0;
	double sum;
	string s;
	cin >> s;
	FOR(i, 0, s.size()) {
		if (s[i] == 'N') {
			n++;
		}
		else if (s[i] == 'S') {
			n--;
		}
		else if (s[i] == 'E') {
			e++;
		}
		else if (s[i] == 'W') {
			e--;
		}
	}
	sum = (double)sqrt((double)n*(double)n + (double)e*(double)e);
	cout << sum << endl;
	return 0;
}