Task: Program Execution
Input (English): 13, 18, ['1669', 'r', '4847', '1473', '3105', '5693', '2727', 'f', '8741', '2285', '8283', 'Z', 'j', 'M', 'S', 'n', '415', 'u', 'M']
Output (English): u514nSMj