Task: Program Execution
Input (English): 1, 18, ['9637', 'y', 'u', 'z', 'g', '4787', 'G', '3037', '5309', '5617', '4465', 'o', '2965', '2341', '1299', 'x', '7361', 'C', '3999', 'z', '8869', '9875', '9799']
Output (English): C7361x129923412965o4465561753093037G4787gzuy9637