title: How can i create a program that asks for input of index of 2d array and outputs the value at that index?
body: <p>Write a program, that allows a user to input integer values and query a 2-dimensional array of size 9x9. Your program should then ask the user for a pair of coordinates,(x,y), separated by a space and return the value at the position specified by the given coordinates.
  For instance, 0 3 should return the value 7 (the value at row one, column four – bearing in mind that array indices start at zero).
  Assume that each integer is a single digit from 1 - 9. Enter -1 for either coordinate to end the program.</p>
  <pre><code>Sample I/O:
  Enter an array:
  359716482
  867345912
  413928675
  398574126
  546281739
  172639548
  984163257
  621857394
  735492861
  
  Enter coordinates: 0 3
  Value = 7
  Enter coordinates: 5 5
  Value = 9
  Enter coordinates: 8 8
  Value = 1
  Enter coordinates: -1 -1
  DONE
  </code></pre>
  <p>This is my code so far:</p>
  <pre><code>arr = input(&quot;Enter an array:\n&quot;)
  
  coordinates = input(&quot;Enter coordinates:\n&quot;)
  x = coordinates[:1]
  y = coordinates[2:3]
  
  while x!= -1 or x!= -1 :
  
  x = coordinates[:1]
  y = coordinates[2:3]
  x = int(x),
  y = int(y)
  value = arr[x][y] 
  print(&quot;Value = &quot;+ arr)
  </code></pre>
  <p>It is very rough. I understand what I need to do and I have an idea of how to do it but the actual programming I struggle with.
  my idea is to create a sentinal loop that exits once the user enters -1 for a coordinate. using a while loop we ask for coordinates and then cut the string to get the individual x and y coordinates then use it to find the number in the specified index.</p>