A = input()
B = input()


def d(s):
    if s == "E":
        return 1+0j
    if s == "W":
        return -1+0j
    if s == "N":
        return 1j
    if s == "S":
        return -1j


st = d(A)
ed = d(B)
cnt = 0
while st != ed:
    cnt += 1
    st = st * (-1j)
print(cnt)