S = input()
N = len(S)
x = 0
y = 0
for i in range(N):
    if S[i] == 'N':
        y += 1
    elif S[i] == 'E':
        x += 1
    elif S[i] == 'W':
        x -= 1
    else:
        y -= 1
print((x**2+y**2)**(1/2))