import math

l = list(raw_input())
x = 0
y = 0
for rec in l:
    if rec == 'N':
        y += 1
    elif rec == 'E':
        x += 1
    elif rec == 'S':
        y -= 1
    elif rec == 'W':
        x -= 1
    else:
        pass
print(math.sqrt(pow(x, 2) + pow(y, 2)))