package main

import . "fmt"
import . "math"

func main() {
	m:=make(map[rune]int)
	for {
		var c rune
		Scanf("%c",&c)
		if c<1 {
			break
		}
		m[c]++
	}
	x:=float64(m['W']-m['E'])
	y:=float64(m['N']-m['S'])
	d:=Sqrt(x*x+y*y)
	Println(d)
}