A solution is a solution

If we don't look at the fact that this solution is absolutely terrible:

• saving arrays' length in variables and still calling len inside the loop
• creating new references to the same arrays, and modifying these references
• assigning ta = a and re-assigning it again if len(a) > len(b) for no reason
• checking that arrays are not empty by looking at their length (the only time those array-length variables were used, which makes them even more useless)
• O(n^3) time complexity because of terrible loops and if's
• useless return inside if block