Task: Program Execution
Input (English): 21, 26, ['4007', 'Q', 'x', '603', 'K', 'R', '103', 't', 'c', '9275', '5387', 'M', '2571', '4017', 'l', '2749', 'u', '2389', '5079', 'r', '8427', 'X', 'd', '9389', 'P', 'R', 'b']
Output (English): R, P, 9389, d, X, 8427