#include<stdio.h>
#include<math.h>
#include<string.h>
int main()
{
	char s[102];
	scanf("%s", s);
	int x, y;
	x = y = 0;
	int i, n = strlen(s);
	for (i = 0; i < n; i++)
	{
		if (s[i] == 'N')y++;
		if (s[i] == 'E')x++;
		if (s[i] == 'S')y--;
		if (s[i] == 'W')x--;
	}
	printf("%.20lf\n", sqrt(x * x + y * y));
	return 0;
}