import java.util.Scanner;

public class PointInRange {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());

        double minDistance = Double.MAX_VALUE;

        for (int i = 0; i < n; i++) {

            String[] point1 = scanner.nextLine().split(",");
            String[] point2 = scanner.nextLine().split(",");

            int x1 = Integer.parseInt(point1[0]);
            int y1 = Integer.parseInt(point1[1]);

            int x2 = Integer.parseInt(point2[0]);
            int y2 = Integer.parseInt(point2[1]);

            double d = Math.sqrt(Math.pow((x1-x2),2)+Math.pow((y1-y2),2));

            System.out.println(String.format("%.2f",d));

            if (minDistance<d){
                minDistance = d;
            }
        }

        System.out.printf("Min Distance: %.2f",minDistance);

    }
}