Task: Program Execution
Input (English): 4, 21, ['X', '7107', 'N', '1405', '5459', 'Y', '9863', 'W', 'c', '5475', 'B', 'V', '249', 'R', '7097', 'b', 'N', 'k', '2539', '3855', 'Y', '5403', '6497']
Output (English): 14055459Y9863Wc5475BV249R7097bNk25393855Y