summation of matrices

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Can we use sum function to add a number of matrices? If not, then how to add a number of matrices with just a single command. Suppose I want to create 10 random matrices of order 5x5 and then want their sum as a result. I tried the following command, but it didn't work.

A_{i}=random_matrix(ZZ,5,5) for i in range(1,10); sum(A_{i}, i, 1, 10)

Note: I even could not generate 10 random matrices with the above command.