import math
a=input()
e=a.count("E")
n=a.count("N")
w=a.count("W")
s=a.count("S")
if e>w:
    b=e-w
else:
    b=w-e
if n>s:
    c=n-s
else:
    c=s-n
d=b*b+c*c
print(math.sqrt(b*b+c*c))