Task: Program Execution
Input (English): 18, 21, ['z', '3517', 'U', '9423', '9567', 'A', 'k', 'e', 'J', 'w', 'R', '7291', '9081', '6109', '805', '4743', 'F', 'Q', '9671', '1811', 'V', '4331', 'o', 'k']
Output (English): V, 1811, 9671, Q