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

using namespace std;

int main(){
	string s;
	cin >> s;
	double count1 = 0, count2 = 0;
	for(int i = 0; i < s.length(); i++){
		if(s[i] == 'N'){
			count1++;
		}else if(s[i] == 'S'){
			count1--;
		}else if(s[i] == 'E'){
			count2++;
		}else{
			count2--;
		}
	}
	cout << sqrt(count1 * count1 + count2 * count2) << endl;
}