Well, that was my soluction:

public class Solution {

public static void main(String[] args) {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */

    Scanner str = new Scanner(System.in);


    for(int i = 1; str.hasNext(); i++){
        String N = str.nextLine();
        System.out.println(i + " " + N);
    }
}

}

My Solution is here, if you any have any feedback you can write a comment.

public class Solution {

public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    List<String> lines = new ArrayList<>();
    int counter = 0;

    while(input.hasNext()){
        counter++;
        String unKnownLine = input.nextLine();

        lines.add(counter + " " + unKnownLine) ;
    }
    input.close();

    for (String n : lines) {
        System.out.println(n);
    }

}  

}

// Here is simple solution with a coutner veriable and using hasNextLine() method. While loop will iterate and give number of iterations a number of lines in input.

import java.io.; import java.util.;

public class Solution {

public static void main(String[] args) {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    Scanner sc = new Scanner(System.in);

    int n =1;

    while (sc.hasNext()) {
        System.out.println(n +" " + sc.nextLine());
        n++;
    } 

    }

}

import java.io.; import java.util.;

public class Solution {

public static void main(String[] args) {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    Scanner sc = new Scanner(System.in);
    ArrayList x = new ArrayList<>();
    int count = 0;
    while (sc.hasNext()) {
        count++;
        String input = sc.nextLine();
        x.add(count+" "+input);
    }
    for (Object i:x){
        System.out.println(i);
    }

}

}

import java.io.; import java.util.;

public class Solution {

public static void main(String[] args) {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    Scanner TakesInput= new Scanner(System.in);
    int count=1;
    while (TakesInput.hasNextLine()) {
         String Input= TakesInput.nextLine();
        System.out.println(count++ +" "+Input);

    }
}

}