Solve problem "Multiply two matrices" online - Learn Python 3 - Snakify

# Multiply two matrices

## Statement

Given three positive integers $$m$$, $$n$$ and $$r$$, $$m$$ lines of $$n$$ elements, giving an $$m \times n$$ matrix $$A$$, and $$n$$ lines of $$r$$ elements, giving an $$n \times r$$ matrix $$B$$, form the product matrix $$A B$$, which is the $$m \times r$$ matrix whose $$(i,k)$$ entry is the sum $$A[i][1] * B[1][k] + \cdots + A[i][n] * B[n][k]$$ and print the result.
In all the problems input the data using input() and print the result using print().