from math import sqrt


def main():
    s = input()
    x, y, = 0, 0

    for d in s:
        if d == 'N':
            y += 1
        elif d == 'E':
            x -= 1
        elif d == 'W':
            x += 1
        elif d == 'S':
            y -= 1

    print(sqrt(x ** 2 + y ** 2))
    
if __name__ == '__main__':
    main()