Task: Program Execution
Input (English): 18, 21, ['k', 'T', '1235', 'r', 'Y', 'M', '4935', '281', '189', '2741', '1963', '4093', '8631', '3809', '7659', '2767', '2791', 's', 'C', '5545', 'B', 'J', '3041', 'u', '6029', 'K', '3935']
Output (English): sC5545B