#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <math.h>
#include <string.h>

int main()
{
	int y = 0;
	int x = 0;
	char str[101] = "";

	scanf("%s", str);

	for (int i = 0;str[i] != '\0';i++)
	{
		if (str[i] == 'N')
		{
			y++;
		}
		else if (str[i] == 'E')
		{
			x++;
		}
		else if (str[i] == 'S')
		{
			y--;
		}
		else if (str[i] == 'W')
		{
			x--;
		}
	}

	y = abs(y);
	x = abs(x);

	printf("%.5lf", sqrt(x * x + y * y));

	return 0;
}