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

int main(void) {
	int i, x = 0, y = 0;
	char s[101];
	scanf("%s", s);
	//printf("%s\n", s);
	i = 0;
	while(s[i] != '\0'){
		switch(s[i]){
		case 'N':
			x--;
			break;
		case 'S':
			x++;
			break;
		case 'E':
			y++;
			break;
		case 'W':
			y--;
			break;
		}
		i++;
	}
	//printf("%d %d\n", x, y);
	printf("%f\n", sqrt(x * x + y * y));
	
	return 0;
}