#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) begin(v),end(v)
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using pii = pair<int, int>;
constexpr ll INF = 1ll<<30;
constexpr ll longINF = 1ll<<60;
constexpr ll MOD = 1000000007;
constexpr bool debug = false;
//---------------------------------//

int main() {
	string S;
	cin >> S;
	int dx[] {1,0,-1,0}, dy[] {0,1,0,-1};
	string strs = "NESW";
	map<char, int> conv;
	REP(i, 4) conv[strs[i]] = i;
	int x = 0, y = 0;
	for (char c : S) {
		const int d = conv[c];
		x += dx[d];
		y += dy[d];
	}
	printf("%.15f\n", hypot(x, y));
}