CF75A.Life Without Zeros

普及/提高-

通过率：0%

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题目描述

Can you imagine our life if we removed all zeros from it? For sure we will have many problems.

In this problem we will have a simple example if we removed all zeros from our life, it's the addition operation. Let's assume you are given this equation $a+b=c$ , where $a$ and $b$ are positive integers, and $c$ is the sum of $a$ and $b$ . Now let's remove all zeros from this equation. Will the equation remain correct after removing all zeros?

For example if the equation is $101+102=203$ , if we removed all zeros it will be $11+12=23$ which is still a correct equation.

But if the equation is $105+106=211$ , if we removed all zeros it will be $15+16=211$ which is not a correct equation.

输入格式

The input will consist of two lines, the first line will contain the integer $a$ , and the second line will contain the integer $b$ which are in the equation as described above ( $1<=a,b<=10^{9}$ ). There won't be any leading zeros in both. The value of $c$ should be calculated as $c=a+b$ .

输出格式

The output will be just one line, you should print "YES" if the equation will remain correct after removing all zeros, and print "NO" otherwise.

输入输出样例

输入#1
```
101
102
```
输出#1
```
YES
```
输入#2
```
105
106
```
输出#2
```
NO
```

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