Java question

The starter code is given as:

import java.util.*; public class AtoY { public static void main(String[] args) { Scanner sc = new Scanner(System.in); char[][] tbl = new char[5][5]; int row = -1, col = -1; String inp; for (int i = 0; i  
Where you write the answer in solve.
 
Im having trouble understanding this. Please eplain your steps. Any help greatly appreciated
  You are given a five-by-five array of cells, some of which contain letters and the others are empty. You need to fill the empty squares with letters so that there is a path moving only horizontally or vertically (not diagonally) at each step that visits all cells with consecutive letters. The letters are lower case 'a through 'y', and 'a' is present in one of the starting cells. For example, a solution to is Another way to describe the correct output is that if you place the cursor over the a', then using only the up, down, left, and right arrows you can move the cursor over the letters 'a' through y' in order Write a program to solve this problem. The input consists of five lines, each containing a string of five lower case letters from 'a to 'z' with no spaces. An 'a' appears exactly once in the five lines. Az, indicates an empty cell. The output is five lines, each containing five characters (without spaces), and the five lines together contain each of the letters through 'y' according to the rules given above For example, if the input is ZZZzZ zfzzz zzzaZ then a correct output is ijklm hgpon efqrs dcbat yxwvu If no solution exists, your program should produce no output. If more than one solution exists, print out just one. Your program should terminate in under a minute for any input Name your program AtoY