Java Solution

public static void kaprekarNumbers(int p, int q) {
// Write your code here
int flag=0;
for(long i=p;i<=q;i++){
    if(i==1){
        System.out.print(1+" ");
        flag=1;
    }
    long sq= i*i;
    String iVal=String.valueOf(i);
    long ilen=iVal.length();
    String sqVal=String.valueOf(sq);
    long sqlen=sqVal.length();
    if(sqlen==1){
        continue;
    }
    String rt=sqVal.substring(sqVal.length()-(int)ilen, sqVal.length());
    String lt=sqVal.substring(0, sqVal.length()-(int) ilen);
    long sm=Long.valueOf(rt)+Long.valueOf(lt);
    if(sm==i){
        System.out.print(i+" ");
        flag=1;
    }

}
if(flag==0){
    System.out.println("INVALID RANGE");
}

}