#include <iostream>
#include <cmath>
using namespace std;
int main(void){
    // Your code here!
    string s;
    cin >> s;
    int n = 0,e = 0,w = 0,ss = 0;
    int len = s.length();
    for(int i = 0; i < len; i++) {
        if(s[i] == 'N') n++;
        else if(s[i] == 'E') e++;
        else if(s[i] == 'W') w++;
        else if(s[i] == 'S') ss++;
    }
    double ans = sqrt(abs(w - e) * abs(w - e) + abs(n - ss) * abs(n - ss));
    cout << ans;
    
}