nextLine() not working after input of a double data type

Question

import java.util.Scanner;

public class test2 {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.println("");
        int i = scan.nextInt();
        double d=scan.nextDouble();
        String s=scan.nextLine();
        System.out.println("String: " + s);
        System.out.println("Double: " + d);
        System.out.println("Int: " + i);
    }
}

Input =:
23
23
mks
output should be:-
String:mks
Double:23.0
Int:23

But It is not taking String input and taking only the double and Int type. Even not asking me for give the input to string type. so,
Input is :
23
23
output is :
String :
double:23.0
Int:23