S = list(input())
now = [0,0]
for s in S:
    if s=="N":
        now[0]+=1
    elif s=="S":
        now[0]-=1
    elif s=="E":
        now[1]+=1
    else:
        now[1]-=1

a = now[0]**2+now[1]**2
print(a**(1/2))