import math

def main():
    S = input()
    tate = 0
    yoko = 0
    for s in list(S):
        if s == 'N':
            tate += 1
        elif s == 'S':
            tate += -1
        elif s == 'W':
            yoko += 1
        else:
            yoko += -1

    print(math.sqrt(tate ** 2 + yoko ** 2))

if __name__ == '__main__':
    main()