#include <bits/stdc++.h>
using namespace std;
using ll = long long;

double x, y;

int main()
{
    string s;
    cin >> s;
    for (int i = 0; i < s.size(); i++)
    {
        if (s[i] == 'N')
            y++;
        else if (s[i] == 'S')
            y--;
        else if (s[i] == 'W')
            x++;
        else
            x--;
    }
    cout << sqrt(x * x + y * y) << endl;
}