Count the ACs

Problem
There are 10 problems in a contest. You know that the score of each problem is either 1 or 100 points.

Chef came to know the total score of a participant and he is wondering how many problems were actually solved by that participant.

Given the total score P of the participant, determine the number of problems solved by the participant. Print −1 in case the score is invalid.
/* package codechef; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner sc=new Scanner(System.in);
		int t=sc.nextInt();
		for(int i=0;i<t;i++){
		    int a=sc.nextInt();
		    if(a<=10){
		        System.out.println(a);
		    }else{
		        int b=a/100;
		        int c=a%100;
		        if((b+c)<=10)
		        {
		            System.out.println(b+c);
		        }else
		        {
		            System.out.println(-1);
		        }
		}
		}// your code goes here
	}
}