Task: Program Execution
Input (English): 12, 19, ['x', 'U', 'W', '6601', '2635', '8877', 'h', '2327', 'H', 'E', '955', 'J', 'L', '1393', 'n', '7099', '345', 'A', 'U', 'y', '627', 'w']
Output (English): UA5439907n3931LJ