dic = {"N": (0, 1), "E": (1, 0), "S": (0, -1), "W": (-1, 0)}
pos = [0, 0]
S = input()
for i in range(len(S)):
    dx, dy = dic[S[i]]
    pos[0] += dx
    pos[1] += dy
print((pos[0] ** 2 + pos[1] ** 2) ** 0.5)