import math
s = input()

x = 0
y = 0
for c in s:
    if c == 'N':
        y -= 1
    elif c == 'E':
        x += 1
    elif c == 'W':
        x -= 1
    elif c == 'S':
        y += 1

print(math.sqrt(x**2 + y**2))