import java.util.*;
import java.io.*;
class Q2
{
public static void main
(String args
[]) {
Scanner d
=new Scanner
(System.
in); int i,j,t;
long x,n;
char ch;
t=d.nextInt();
for(i=0;i<t;i++)
{
long temp=0L,d1,small;
n=d.nextLong();
x=d.nextLong();
for(j=1;x>temp;j++)
temp
=temp
+(9*((long)Math.
pow(10,j
-1))*j
); --j;
temp
-=9*(long)Math.
pow(10,j
-1)*j
; x=x-temp;
d1=x%j;
x=x/j;
small
=(long)Math.
pow(10,j
-1); if(j==1)
else
{
small+=x;
ch=s.charAt((int)d1-1);
}
}
}
}
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