#include <iostream>
#include <vector>
#include <algorithm>
#include <math.h>

#define ALL(x) (x).begin(),(x).end()

using namespace std;

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