import math
S=list(input())
x=0.0
y=0.0
for i in range (len(S)):
    if S[i]=="N":
        y+=1.0
    elif S[i]=="S":
        y-=1.0
    elif S[i]=="E":
        x+=1.0
    elif S[i]=="W":
        x-=1.0
x*=x
y*=y
x+=y
x=math.sqrt(x)
print(x)