import math
x, y = 0, 0
for s in list(input()):
    if s == 'N':
        y += 1
    elif s == 'E':
        x += 1
    elif s == 'W':
        x -= 1
    else:
        y -= 1
print(math.sqrt(pow(abs(x),2)+pow(abs(y),2)))