#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("Yes");}else{puts("No");}
#define MAX_N 200005

int main() {
    string s;
    cin >> s;

    double NS = 0;
    double EW = 0;

    rep(i,s.size()){
        if(s[i] == 'N') NS += 1;
        if(s[i] == 'S') NS -= 1;
        if(s[i] == 'E') EW += 1;
        if(s[i] == 'W') EW -= 1;
    }


    cout << sqrt(NS * NS + EW * EW) << endl;

    return 0;
}