题目描述

$A+B$ is a problem used to test one's basic knowledge for competitive programming. Here is yet another boring variation of it.

You have two integers, $A$ and $B$. You want to make them equal. To do so, you can perform several steps, where each step is one of the following:

• $A$+=$A$
• $A$+=$B$
• $B$+=$A$
• $B$+=$B$

Unfortunately, $A+B$ is a hard problem for us, so you are allowed to make at most 5000 steps.

输入格式

Two integers $A, B$ are given. ($1 \le A, B \le 10^{18}$).

输出格式

In the first line, print a single integer $n$ ($0 \le n \le 5000$) denoting the number of steps.

In next $n$ lines, print one of the following strings to denote your desired operation: $A$+=$A$, $A$+=$B$, $B$+=$A$, or $B$+=$B$.

Any sequence of steps that yields the desired result will be judged correct.

2 3

4
B+=B
B+=A
A+=A
A+=A