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

int main(void){
	double ns=0,ew=0;
	int i,l;
	char s[128];
	scanf("%s",s);
	l = strlen(s);
	for(i = 0;i < l;i++){
		if(s[i] == 'N'){ns = ns + 1;}
		if(s[i] == 'S'){ns = ns - 1;}
		if(s[i] == 'E'){ew = ew + 1;}
		if(s[i] == 'W'){ew = ew - 1;}
	}
	ns = sqrt(ns*ns+ew*ew);
	printf("%.20lf",ns);
	return 0;
}