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

#define SZ(a) (int)a.size()
#define ALL(a) a.begin(), a.end()
#define FOR(i, a, b) for (int i = (a); i<(b); ++i)
#define RFOR(i, b, a) for (int i = (b)-1; i>=(a); --i)
#define MP make_pair
#define PB push_back
#define F first
#define S second
#define FILL(a, b) memset(a, b, sizeof(a))

typedef long long LL;
typedef pair<int, int> PII;
typedef vector<int> VI;

const int INF = 1e9 + 7;

map<char, int> m;

double ang(string s)
{
	double res = m[s[0]];
	FOR (i, 1, SZ(s))
	{
		double x = m[s[i]];
		if (s[i] == 'N' && res > 180) x = 360; 
		res = (res + x) / 2;
	}
	return res;
}

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	
	m['N'] = 0;
	m['E'] = 90;
	m['S'] = 180;
	m['W'] = 270;
	
	string s, t;
	cin >> s >> t;
	reverse(ALL(s));
	reverse(ALL(t));
	
	double ans = ang(t) - ang(s);
	if (ans < 0) ans += 360;
	if (ans > 180) ans = 360 - ans;
	cout << fixed << setprecision(7) << ans << '\n';
	
	return 0;
}