Task: Program Execution
Input (English): 15, 18, ['f', 'Y', 'D', 'C', '4877', '9727', '6183', '5235', 'I', '617', '8337', '4359', 'C', 'h', 'Y', '3733', 'E', 'b', 'j', '9001', '8929']
Output (English): Y3733Eb