// No.113 宝探し
package main

import (
	"fmt"
	"math"
)

func main() {
	var s string
	fmt.Scan(&s)

	type P struct {
		X float64
		Y float64
	}
	p := P{X: 0, Y: 0}
	for _, r := range s {
		switch string(r) {
		case "N":
			p.X += 1
		case "S":
			p.X -= 1
		case "E":
			p.Y += 1
		case "W":
			p.Y -= 1
		}
	}
	fmt.Println(math.Sqrt(math.Pow(p.X, 2) + math.Pow(p.Y, 2)))
}