#include <iostream>
#include <stdio.h>
#include <string>
#include <math.h>
using namespace std;
int x=0;
int y=0;
void move(char direct)
{
	switch(direct){
		case 'N':
			y++;
			break;
		case 'S':
			y--;
			break;
		case 'W':
			x--;
			break;
		case 'E':
			x++;
			break;
	}
}
int main(int argc, char* argv[])
{
	string S;
	cin>>S;
	for (int i=0;i<S.size();i++){
		move(S[i]);
	}
	double dist=sqrt((double)(x*x+y*y));
	if (dist==(int)dist){
		cout<<dist<<endl;
	}else{
		printf("%.5lf\n",dist);
	}
	return 0;
}