import math

s = input().strip()
x, y = 0, 0

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

distance = math.sqrt(x ** 2 + y ** 2)
formatted = "{0:.5f}".format(distance)
if '.' in formatted:
    formatted = formatted.rstrip('0').rstrip('.')
print(formatted)