int count = 0;
    for(int i = p; i <= q; i++)
    {
        unsigned long squared = (unsigned long) i*i;
        string str = to_string(squared);
        int str_size = str.length();
        
        if(str_size == 1)
        {
            if(squared == (unsigned long)i)
            {
                cout << i << " ";
                count++;
            }
        }
        else if(str_size > 1)
        {
            //cout << "Squared: " << squared << ", " << stoi(str.substr(0,str_size/2)) << ", " << stoi(str.substr(str_size/2,str_size-1)) << endl;
            int left = stoi(str.substr(0,str_size/2));
            int right = stoi(str.substr(str_size/2,str_size-1));
            //cout << "Left: " << left << ", right: " << right << endl;
            
            int sum = left + right;
            
            if(sum == i)
            {
                cout << i << " ";
                count++;
            }
        }
    }
    if(count == 0)
        cout << "INVALID RANGE\n";