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

typedef long long ll;
typedef long double ld;
typedef pair<ll, ll> ii;
typedef vector<ll> vi;
typedef vector<vi> vvi;
typedef vector<vvi> vvvi;
typedef vector<vvvi> vvvvi;
typedef vector<ii> vii;

#define x first
#define y second
#define pb push_back
#define eb emplace_back
#define all(v) (v).begin(), (v).end()

map<char, ld> D {{'N',0},{'E',90},{'S',180},{'W',270}};

ld conv(string X) {
	ll n = X.size();
	if (n == 1) return D[X[0]];
	ld res = (D[X[n-1]] + D[X[n-2]])/2;
	if (abs(res-D[X[n-1]]) > 90) res += 180;
	ld prev = res;
	for (ll i = max(0ll,n-28); i < n-2; i++) {
		res += D[X[i]];
		res *= 0.5;
		if (abs(prev-res) > 90) res += 180;
		prev = res;
	}
	return res;
}

void run() {
	string X, Y;
	cin >> X >> Y;
	ld r = fmod(abs(conv(X)-conv(Y)),360);
	cout << min(r, 360-r) << endl;
}

signed main() {
    ios_base::sync_with_stdio(false); cin.tie(0);
	cout << fixed << setprecision(20);
    run();
    return 0;
}