Task: Program Execution
Input (English): 7, ['5645', 'U', 't', 'b', 'k', 'R', '5507', '6601', '5861', '8889', 'T', 'U', '3309', 'x', '7489']
Output (English): 6601, 5861, 8889, T, U, 3309, x, 7489