s = input()
x = 0
y = 0
for i in range(len(s)):
    if s[i] == 'N':
        y += 1
    if s[i] == 'E':
        x += 1
    if s[i] == 'W':
        x -= 1
    if s[i] == 'S':
        y -= 1
print(((x**2)+(y**2))**0.5)