Task: Program Execution
Input (English): 15, 18, ['497', '6595', 'W', 'w', '7683', '3433', '1861', '2603', 'H', '5451', 'f', '5405', 'a', '3311', '2691', 'M', '3119', 'K', '8969']
Output (English): K3119M2691