char a = 5;
    scanf("%c", &a);
    int eger = 0;
    while(a != '\n')
    {
        if(a < '0' || a > '9')
            return 0;
        else
            eger = eger * 10 + (a - '0');
        scanf("%c", &a);
    }
    std::cout << eger;