Task: Program Execution
Input (English): 5, 6, ['4709', '6927', 'v', '9249', 'B', '1203', 'M', '6783', 'S', '6609', 'F', '1479', '9569', '9099', '255', 'g', 'V', 'c', '5423', '3951', '4743', 'Y', '8457', 'u', 'B']
Output (English): B1203