#include <bits/stdc++.h>
#include <atcoder/all>


using namespace std;
using namespace atcoder;
#define rep(i,m,n,k) for (int i = (int)(m); i < (int)(n); i += (int)(k))
#define rrep(i,m,n,k) for (int i = (int)(m); i > (int)(n); i += (int)(k))
#define ll long long
#define list(T,A,N) vector<T> A(N);for(int i=0;i<(int)(N);i++){cin >> A[i];}


int main(){
    string S;
    cin >> S;
    long double X = 0;
    long double Y = 0;
    map<char,long double> m;
    for (auto s:S){
        m[s]++;
    }
    X = m['N'] - m['S'];
    Y = m['E'] - m['W'];
    cout << fixed << setprecision(10);
    cout << sqrt(X*X + Y*Y) << endl;
    return 0;

}