mode = []
    highestCount = 0
    for i in input_list:
        if (input_list.count(i) > 1):
            if (input_list.count(i) > highestCount):
                mode = []
                mode.append(i)
                highestCount = input_list.count(i)
            if (input_list.count(i) == highestCount):
                mode.append(i)
    mode = list(set(mode))
    mode = list_sort(mode)
    return mode