#include <bits/stdc++.h>
using namespace std;
int a,b;
void solve()
{
int rev , temp , digs , sum = 0;
scanf("%d %d",&a,&b);
while(a < b)
{
rev = 0;
temp = a;
while(temp > 0){
digs = temp % 10;
rev = (rev * 10) + digs;
temp /= 10;
}
if(rev == a)
sum += rev;
a++;
}
printf("%d\n",sum);
}
int main()
{
int t;
scanf("%d",&t);
for(int i = 0; i < t; i++)
solve();
return 0;
}
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