import math
dat = input()
pos = [0, 0]
for i in dat:
    if(i == 'W' or i == 'E'):
        pos[0] += -1 if i == 'W' else 1
    else:
        pos[1] += -1 if i == 'S' else 1
print(round(math.sqrt(pos[0]**2 + pos[1]**2), 5))