Task: Program Execution
Input (English): 1, 9, ['7139', 'G', '9693', 'y', 'Z', '1581', '7279', '2587', 'C', '7141', 'V', '2077', 'a', 'u', 'B', 'k', 'D', '1371', '2525', 'r', 'q', '8679', '3657', 'x', 'g', 'f', 'C', 'x', 'P', 'V']
Output (English): 7139, 7141, 2525, x