Hello y'all!
I don't understand what's wrong with my code.When i tested it on my own it worked perfectly).but when i've sent it, it got WA#3.Can u tell me what's wrong,PLEASE).Here's my code in C++:
int sum(long a)
{
    return a/100+(a%100)/10+a%10;
}
bool islucky(long t)
{
    long t1=t/1000,t2=t%1000,a1=sum(t1),a2=sum(t2);
    if(a1==a2)
        return true;
    else
        return false;
}
int main()
{
    long t;
    cin>>t;
    long t1,t2;
    t1=t+1;
    t2=t-1;
    if(islucky(t1)||islucky(t2))
    {
        cout<<"Yes"<<endl<<t1<<endl<<t2;

    }
    else
        cout<<"No";
    return 0;
}