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
        
res = math.sqrt(x * x + y * y)

print(res)