A boy lost the password of his super locker. He remembers the number of digits **N** as well as the sum **S** of all the digits of his password. He know that his password is the largest number of **N** digits that can be possible with given sum **S**. As he is busy doing his homework, help him retrieving his password.

**Input:**

The first line of input contains an integer **T** denoting the number of test cases. Then **T** test cases follow. The first line of each test case contains two space separated integers **N** and **S**, where **N** is the number of digits in password and **S** is the sum of all the digits of the password.

**Output:**

Corresponding to each test case, in a new line, print the largest integer if possible , else print -1.

**Constraints:**

1 <= T <= 100

1 <= N <= 10^{4}

0 <= S <= 10^{6}

**Example:**

**Input:**

3

5 12

3 29

3 26

**Output:**

93000

-1

998

**Explanation :**

**Testcase 1:** Sum of elements is 12. Largest possible 5 digit number is 93000.

**Testcase 2:** There is no such three digit number whose sum is 29.

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