S = input()
x = 0
y = 0
dx = {'N':1, 'S':-1, 'E':0, 'W':0}
dy = {'N':0, 'S':0, 'E':1, 'W':-1}

for d in S:
    x += dx[d]
    y += dy[d]
print((x**2+y**2)**0.5)