s = input()
pos = [0, 0]
for news in s:
    if news == "N":
        pos[0] += 1
    elif news == "S":
        pos[0] -= 1
    elif news == "E":
        pos[1] += 1
    elif news == "W":
        pos[1] -= 1
d = (pos[0] ** 2 + pos[1] ** 2) ** 0.5
print(d)