#!/usr/bin/env python3
deg = {"N": 0, "E": 90, "S": 180, "W": 270}


def degrees(d):
    ans = deg[d[-1]]
    for w in reversed(d[:-1]):
        ans = (ans + deg[w]) / 2
    return ans


X, Y = input().strip().split()
print(min((degrees(X) - degrees(Y) + 360) % 360, (degrees(Y) - degrees(X) + 360) % 360))