Освободите принцессу из замка-кода:
castle = [1, ["c"], 543, "P", ["n", ["r"]], "i", [[["s"]]]]

Ответ: ['P', 'R', 'I', 'N', 'C', 'S']

Объяснение:

castle = [1, ["c"], 543, "P", ["n", ["r"]], "i", [[["s"]]]]

Outside_the_Castle_Code = []

Outside_the_Castle_Code.extend (castle)

castle.clear ()

Outside_the_Castle_Code.clear ()

Outside_the_Castle_Code.append ("P")

Outside_the_Castle_Code.append ("R")

Outside_the_Castle_Code.append ("I")

Outside_the_Castle_Code.append ("N")

Outside_the_Castle_Code.append ("C")

Outside_the_Castle_Code.append ("S")

print (Outside_the_Castle_Code)