#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);

    string s; cin >> s;
    double x = 0, y = 0;
    rep(i,s.size()){
        if(s[i] == 'N') y++;
        if(s[i] == 'E') x++;
        if(s[i] == 'W') x--;
        if(s[i] == 'S') y--;
    }
    cout.precision(17);
    cout << sqrt(x*x+y*y) << endl;
}