class Goods:
    def __init__(self,goods=[]):
        self.goods=goods


    def __str__(self):
        return str(self.goods)

    def append(self,data):
        self.goods.append(data +"\n")

    def wrote(self):
        f = open(r"C:\Users\nikit\Downloads\asdf.txt", "w")
        for i in self.goods:
            f.write(i)
        f.close()

    def max_price(self):
        cnt=0
        l=[]
        for i in self.goods:
            c=i.split(" ")
            if cnt < int(c[3]):
                cnt =int(c[3])
                l.clear()
                l.append(i)
        print(l)

    def all_companies(self):
        l=[]
        for i in self.goods:
            c=i.split(" ")
            if c[2] not in l:
                l.append(c[2])
        print(l)

    def sum_all_prices(self):
        sum=0
        for i in self.goods:
            c=i.split(" ")
            sum+=int(c[3])
        print(sum)


    def __iter__(self):
        return self

    def __next__(self):
        return self




meow=open(r"C:\Users\nikit\Downloads\lrh.txt","r")
texts=meow.readlines()
print(texts[0])
a=Goods(texts)
print(a)
a.append("Клавиатура Math3 Card 70000")
print(a)
meow.close()
a.wrote()
a.max_price()
a.all_companies()
a.sum_all_prices()
a.append("Комп 45667 Apple 4500")
a.all_companies()