import math

def main():
    S = input()

    str_ = dict()
    for s in S:
        str_[s] = str_.get(s, 0) + 1

    x = abs(str_.get('W', 0) - str_.get('E', 0))
    y = abs(str_.get('N', 0) - str_.get('S', 0))
    ans = math.sqrt(x ** 2 + y ** 2)
    print(ans)

main()