using System;

public class Test
{
	public static void Main()
	{
		var s = Console.ReadLine();
		
		int x = 0;
		int y = 0;
		foreach(char c in s)
		{
			if(c == 'N') y++;
			else if(c == 'S') y--;
			else if(c == 'E') x++;
			else x--;
		}
		
		Console.WriteLine(Math.Sqrt(x * x + y * y));
	}
}