Problem D
Elementary Math
Ellen has already chosen the $n$ pairs of numbers. All that remains is to decide for each pair which of the three possible operations the students should perform. To avoid students getting bored, Ellen wants to make sure that the $n$ correct answers to her exam are all different.
Please help Ellen finish constructing the exam by automating this task.
Input
The input consists of:

one line with one integer $n$ ($1\leq n \leq 2\, 500$), the number of pairs of numbers;

$n$ lines each with two integers $a$ and $b$ ($10^6 \leq a, b \leq 10^6$), a pair of numbers used.
Output
For each pair of numbers $(a,b)$ in the same order as in the input, output a line containing a valid equation. Each equation should consist of five parts: $a$, one of the three operators, $b$, an equals sign ($=$), and the result of the expression. All the $n$ expression results must be different.
If there are multiple valid answers you may output any of them. If there is no valid answer, output a single line with the string “impossible” instead.
Sample Input 1  Sample Output 1 

4 1 5 3 3 4 5 1 6 
1 + 5 = 6 3 * 3 = 9 4  5 = 1 1  6 = 5 
Sample Input 2  Sample Output 2 

4 4 2 4 2 4 2 4 2 
impossible 