#include <iostream>
#include <fstream>  
#include <math.h>  
using namespace std;
 ifstream f("euclid2.in");  
 ofstream g("euclid2.out"); 
long long t,a,b,n,i;
long long cmmdc(long long a,long long b)
{   
        long long r;
        r=a%b;
        while(r!=0)
         {a=b; b=r; r=a%b;}
return b;
}
void ReadData()
{f>>n;
      for(i=1;i<=n;i++)
       { f>>a>>b; t=cmmdc(a,b); g<<t<<endl;}
}   
 int main()
 {ReadData();
 f.close(); 
 g.close();
 return 0;}