import math
S = raw_input()
y = 0;x = 0
for d in S:
    if (d == 'N'):
        y += 1
        
    if (d == 'E'):
        x += 1
        
    if (d == 'W'):
        x -= 1

    if (d == 'S'):
        y -= 1
print ("%.20f") % (math.sqrt(x ** 2 + y ** 2))