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

int main(){
	char str[100];
	scanf("%s",str);
	double tate,yoko;
	for(int i = 0;i < (int)strlen(str);i++){
		if(str[i] == 'N'){
			tate++;
		}else if(str[i] == 'S'){
			tate--;
		}else if(str[i] == 'E'){
			yoko++;
		}else if(str[i] == 'W'){
			yoko--;
		}
	}
	printf("%.20lf\n", sqrt(yoko * yoko + tate * tate));
}