#include <iostream>
using namespace std;
int main() 
{
 int test,l,r,rev=0,sum=0;
 cin>>test;
 for(int i=0;i<test;i++)
 {
 	cin>>l>>r;
  	sum=0;
   	for(int j=l;j<=r;j++)
    { 
    	rev = 0;//initialise the reversed number to zero for every j 
    	int temp = j;// store j in a temporary variable, we dont want to modify the loop counter variable
    	while(temp>0)
    	{
    		rev = rev*10 + temp%10;
    		temp/=10;
    	}
      	if(rev==j)//if it is a palindrome add it 
      		sum=rev+sum;
    }
    cout<<sum<<endl;
 }
return 0;
}

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MQoxIDEwMDA=

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