# coding: utf-8
# yukicoder No.113 宝探し

S = input()
takara = [0, 0] # 宝の位置座標

for i in S:
    if i == "N":
        takara[1] += 1
    elif i == "S":
        takara[1] -= 1
    elif i == "E":
        takara[0] += 1
    else:
        takara[0] -= 1

print("{:.3f}".format((takara[0] ** 2 + takara[1] ** 2) ** 0.5))