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

int main(void)
{
	char str[101];
	int n = 0, e = 0, w = 0, s = 0;
	int i;

	scanf("%s", str);

	for (i = 0; i < strlen(str); i++) {
		if (str[i] == 'N')
			n++;
		else if (str[i] == 'E')
			e++;
		else if (str[i] == 'W')
			w++;
		else
			s++;
	}

	n -= s;
	e -= w;

	printf("%.5f\n", sqrt(n * n + e * e));

	return 0;
}