double day,month;
    start:
    cout << "day:"; cin >> day;
    cout << "month:"; cin >> month;

    if (day<=0) return 0;
    if (month<=0) return 0;
    if ((day>=21 && month ==3) || (day>0 && month ==4)|| (day>0 && month ==5) ||(day<22 && month ==6)) // -------------------------------------------------start of the block
{
    cout << "it's spring" << endl;
}
    else if ((day>=22 && month ==6) || (day>0 && month ==7)||(day>0 && month ==8) || (day<23 && month ==9))
     {
         cout<< "it's summer"<< endl;
     }
    else if ((day>=23 && month ==9) || (day>0 && month ==10)||(day>0 && month ==11) || (day<24 && month ==12))
    {
        cout<< "it's autumn" <<endl;
    }
    else if ((day>=34 && month ==12) || (day>0 && month ==1)||(day>0 && month ==2) || (day<23 && month ==3))
    {
        cout<< "it's winter" << endl;
    }

    goto start; // loop back