Task: Program Execution
Input (English): 3, 12, ['4187', '2027', '1157', 'x', 'M', 't', '7321', 's', 'c', '9831', '2137', 'H', '241', '7201', 'i', 't', 'x', 'k', 'r', '419']
Output (English): H21379831cs7321tMx1157