Task: Program Execution
Input (English): 4, 20, ['O', '1087', 'r', '7529', 'K', 'f', 'B', 'k', 'b', 'O', '2343', 'n', '8565', '7791', 'C', 'N', '5369', '1913', '5137', 'D']
Output (English): D513719135369NC77918565n2343ObkBfK7529