Universal Cup Judging System

Universal Cup

时间限制： 3 s 内存限制： 1024 MB 总分： 100 难度: [显示]

本题由以下用户出题 bulijiojiodibuliduo .

AI Translation — This statement was translated using AI and may contain inaccuracies. Please refer to the original statement if in doubt.

给定一个正整数 $x$，求最小的正整数 $y$，使得 $x+y$ 的进位次数恰好为 $k$。

我们使用小学数学中学习的十进制列竖式加法来计算进位。例如，在下面的加法中，共有两次进位。

输入格式

第一行包含一个整数 $T$ ($1 \le T \le 10^5$)，表示测试用例的数量。

对于每个测试用例，第一行包含两个整数 $x, k$ ($1 \le x < 10^{18}, 0 \le k \le 18$)。

输出格式

对于每个测试用例，输出一行，表示答案。如果不存在这样的 $y$，则输出 $-1$。

样例

输入格式 1

4
12345678 0
12345678 5
12345678 18
990099 5

输出格式 1

1
54322
999999999987654322
9910

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