Task: Program Execution
Input (English): 6, 15, ['u', '5099', 'P', '8617', '3125', 'z', '5667', 'y', '2163', '5671', 'L', '2873', '8513', 'M', 'Z', '1609', 'l', '3381', '9379', '9799', '7513']
Output (English): z5667y21635671L28738513MZ