# coding:utf-8
        # join list
        
        list1 = ["a", "b", "c"]
        list2 = [1, 2, 3]
        list3 = list1 + list2
        print(list3)
        
        print(list3[0]+list3[2])
        print(list3[-1]+list3[-2])
        #print(list3[-1]+list3[0]) 実行できない

        list1 = ["a", "b" , "c"]
        list2 = [1, 2, 3]
        for x in list2:
          list1.append(x)
        print(list1)
        
        list1 = ["a", "b" , "c"]
        list2 = [1, 2, 3]
        list1.append(list2)
        print(list1)

        list1 = ["a", "b" , "c"]
        list2 = [1, 2, 3]
        list1.extend(list2)
        print(list1)

        list1.clear()
        print(list1)
        print(list2)
        
        list1.clear()
        print(list1)
        print(list2)