Task: Program Execution
Input (English): 4, 6, ['Q', '861', '445', 'U', 'd', 't', 'k', 'I', 'e', '6833', '337', '2853', '3833', 'l', '3773', '6355', 'P', 'T', '6101', '5061', '4697', '4651', 'n', '9121', '4091', 'a']
Output (English): U, 6833, 6355, 4651