It is giving me wrong answer

#1

even though my sample input is giving right output but my testcases are not passing

#2

Take input in the for of strings. Then sort it with a custom comaprator
The custom compare function must be something like this:
bool mycompare(string a,string b)
{
string ab=a+b;
string ba=b+a;
return ab>ba;
}

Consider a case:
1
2
98 9

Expected O/p:
998