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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int main()
{
    int n,a,b,r;
    fin>>n;
    while(n>0)
    {
        fin>>a>>b;
        while(b!=0)
        {
            r=a%b;
            a=b;
            b=r;
        }
        fout<<a;
        while(n>1)
        {
            fout<<endl;
        }
        n--;
    }
}