#include <sstream>
#include <string>
#include <vector>
#include <map>
#include <algorithm>
#include <iostream>
#include <utility>
#include <set>
#include <cctype>
#include <queue>
#include <stack>
#include <cstdio>
#include <cstdlib>
#include <cmath>

#define INF 1000000000

using namespace std;
typedef long long ll;

int main(void) {
    int tate = 0, yoko = 0;
    string s;
    cin >> s;
    for (int i =0; i < s.size(); i++) {
        if (s[i] == 'N') tate++;
        if (s[i] == 'S') tate--;
        if (s[i] == 'E') yoko++;
        if (s[i] == 'W') yoko--;
    }
    double ret = sqrt(tate*tate+yoko*yoko);
    printf("%.10lf\n", ret);
    return 0;
}