#include<cmath>
#include<iostream>
#include<string>
using namespace std;

int ang(char ch) {
	if (ch == 'N') return 0;
	if (ch == 'E') return 90;
	return ch == 'S' ? 180 : 270;
}

double angle(string &s) {
	double res = ang(s.back());
	for (int idx = s.size() - 1; idx --> 0; )
		res = 0.5 * (res + ang(s[idx]));
	return res;
}

signed main() {
	string a, b;
	cin >> a >> b;
	double D = fabs(angle(a) - angle(b));
	cout << min(D, 360.0 - D) << endl;
	return 0;
}