Task: Program Execution
Input (English): 19, 21, ['L', '5207', '5219', '729', '7877', 'R', '4143', 'z', '6359', 'U', 'x', 'E', '8545', 'N', 'A', '6511', 'Z', 'V', '5663', '1565', 'W', '2921', '7641']
Output (English): 5663, 1565, W