Task: Program Execution
Input (English): [[-64, -143], [-102, -53, -167, 56, -22], [7, 87, 1], [-39, 45, -129, 17, 14, 21, -149], [60, -189, 61, -71, 29, -16], [20, 17, 18, 42]]
Output (English): [-64, 56, 87, 45, 61, 42]