Given a numeric array of arbitrary size, return the row index of the last zero for each column. If a column contains all nonzero values, return 0 for that column. Your output should be a row vector.
Example
a = [0 0 9 0;
0 0 1 8;
0 0 4 0;
0 0 2 3;
0 6 7 5];
z = [5 4 0 3]
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