Task: Program Execution
Input (English): 4, 9, ['M', 'Q', 'p', 'U', '6315', 'p', 'X', 'U', '3129', 'z', '6667', 'U', 'T', '607', 'J', 'S', 'V', '2757', '7537', 'E', '9739', 'n', '3479', 'R', '159', 'r']
Output (English): 3129UXp6315U