import sequtils,strutils,math
var
    S = stdin.readline
    x,y : int
    ans : float

for s in S:
    case s
    of 'N':
        y += 1
    of 'E':
        x += 1
    of 'W':
        x -= 1
    of 'S':
        y -= 1
    else:
        discard
ans = x.abs.float * sqrt(1 + pow(y / x, 2))
echo ans