// yukicoder: No.113 宝探し
// 2019.4.11 bal4u

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

char s[105], *p = s;

int main()
{
	int x, y;

	scanf("%s", s);
	x = y = 0;
	while (*p) {
		if (*p == 'N') y++;
		else if (*p == 'E') x++;
		else if (*p == 'W') x--;
		else y--;
		p++;
	}
	printf("%lf\n", sqrt(x*x + y*y));
	return 0;
}