from math import sqrt

S = input()

n = len(S)
directions = {'N': (0, 1), 'E': (1, 0), 'W': (-1, 0), 'S': (0, -1)}
x, y = 0, 0
for i in range(n):
    dx, dy = directions[S[i]]
    x += dx
    y += dy
print(sqrt(x**2 + y**2))