#include <iostream>
#include <vector>
using namespace std;
  
int main() {
  int a,b;
  cin >> a >> b;
  int cnt=0;
  for (int i=a;i<=b;i++){	
	if(i/1000 == (i%10)*10+(i%100-i%10)/10) cnt++;
  }
  cout << cnt;
}
### Prompt

Construct a cpp code solution to the problem outlined:

Find the number of palindromic numbers among the integers between A and B (inclusive). Here, a palindromic number is a positive integer whose string representation in base 10 (without leading zeros) reads the same forward and backward.

Constraints

* 10000 \leq A \leq B \leq 99999
* All input values are integers.

Input

Input is given from Standard Input in the following format:


A B


Output

Print the number of palindromic numbers among the integers between A and B (inclusive).

Examples

Input

11009 11332


Output

4


Input

31415 92653


Output

612

### Response

```cpp
#include <iostream>
#include <vector>
using namespace std;
  
int main() {
  int a,b;
  cin >> a >> b;
  int cnt=0;
  for (int i=a;i<=b;i++){	
	if(i/1000 == (i%10)*10+(i%100-i%10)/10) cnt++;
  }
  cout << cnt;
}
```