using System;

class No113{
    static void Main(){
        var a=Console.ReadLine();
        var x=0;
        var y=0;
        foreach(char b in a){
            switch(b){
                case 'N':++y;break;
                case 'S':--y;break;
                case 'E':++x;break;
                case 'W':--x;break;
            }
        }
        Console.WriteLine("{0:f4}",Math.Sqrt(x*x+y*y));
    }
}