Task: Program Execution
Input (English): 1, 6, ['m', '8231', '3903', 'Z', '4637', 'B', '5871', 'R', 'N', '1257', '7435', 'r', 'c', 'M', 'w', '583', '6609', 'P', '903', '287', 'Y', '6183']
Output (English): m82313903Z4637B