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

int main() {
	char s;
	int x = 0, y = 0;

	while ((s = getchar()) != '\n') {
		if (s == 'N') y++;
		else if (s == 'E') x++;
		else if (s == 'W') x--;
		else if (s == 'S') y--;
	}

	printf("%.3lf\n", sqrt(x*x + y*y));
	return 0;
}