Task: Program Execution
Input (English): [6451, 8721, '7691', '5751', '753', '4885', 'Z', 'T', 3927, 6309], ['Z', 'R', '7691', '5751', '753', '4885', 'Z', 'b', 5507, 719, 3139]
Output (English): 7691, 5751, 753, 4885, Z