CF260A.Adding Digits

普及/提高-

通过率：0%

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题目描述

The first line contains three integers: $a,b,n\ (1<=a,b,n<=10^{5})$ .

输入格式

In a single line print the integer without leading zeros, which Vasya can get when he applies the lengthening operations to number $a\ n$ times. If no such number exists, then print number -1. If there are multiple possible answers, print any of them.

输出格式

无

输入输出样例

输入#1
```
5 4 5
```
输出#1
```
524848
```
输入#2
```
12 11 1
```
输出#2
```
121
```
输入#3
```
260 150 10
```
输出#3
```
-1
```

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