Task: Program Execution
Input (English): 4, 18, ['7881', 'X', 'P', 'S', 'b', 'u', 'W', '5181', '8535', 'U', 'D', '2377', '6055', 'M', 'Z', '5867', '4973', '7759', '5275', 'L', 'j', 'm', '7259', 'U']
Output (English): SbuW51818535UD23776055MZ586749737759