#include <bits/stdc++.h>
using namespace std;

#define BIT(x) (1ull << (x))
#define FOR(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
#define REP(i, n) FOR(i, 0, n)
#define RFOR(i, a, b) for (int i = (int)(b) - 1; i >= (int)(a); i--)
#define RREP(i, n) RFOR(i, 0, n)
#define EACH(i, v) for (__typeof((v).begin()) i = (v).begin(); i != (v).end(); ++i)
#define ALL(v) (v).begin(), (v).end()
#define RALL(v) (v).rbegin(), (v).rend()
#define UNIQ(v) do {sort(ALL(v)); (v).erase(unique(ALL(v)), (v).end());} while (0)
#define PB push_back
#define MP make_pair
#define SIZE(v) ((int)(v).size())
#define DEBUG(x) cout << #x << " = " << x << endl

using P = complex<double>;
P dir[] = {{-1., 0.}, {0., 1.}, {0., -1.}, {1., 0.}};
map<char, int> conv = {{'N', 0}, {'E', 1}, {'W', 2}, {'S', 3}};

int main()
{
	string s;
	cin >> s;
	P p(0., 0.);
	EACH(it, s) p += dir[conv[*it]];
	printf("%.20f\n", abs(p));
}