from math import sqrt


def main():
    S = input()

    destination = [0, 0]
    for direction in S:
        match direction:
            case "N":
                destination[1] += 1
            case "S":
                destination[1] -= 1
            case "E":
                destination[0] += 1
            case "W":
                destination[0] -= 1

    print(sqrt(destination[0] ** 2 + destination[1] ** 2))


if __name__ == "__main__":
    main()