user$\_$input$=$ input$()$

lines $=$ user$\_$input.split$(\text{'},\text{'})$

# This line uses a construct called a list comprehension, introduced elsewhere,

# to convert the input string into a two$-$dimensional list.

# Ex: $12,24$ is converted to $[[1,2],[2,4]]$

mult$\_$table $=[[$int$($num$)$ for num in line.split$()]$ for line in lines$]$

$\text{'}\text{'}\text{'}$ Your solution goes here $\text{'}\text{'}\text{'}$