package main

import (
	"fmt"
	"math"
)

func resolve(S string) float64 {
	NS := float64(0)
	EW := float64(0)

	for _, s := range S {
		switch s {
		case 'N':
			NS += 1
		case 'E':
			EW += 1
		case 'W':
			EW -= 1
		case 'S':
			NS -= 1
		}
	}
	return math.Sqrt(NS*NS + EW*EW)
}

func main() {
	var S string

	fmt.Scanf("%s\n", &S)

	fmt.Println(resolve(S))
}