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#include <iostream>
#include <fstream>
using namespace std;
int main()
{   ifstream fin ("euclid2.in");
    ofstream fout( "euclid2.out");
    int t;
    fin>>t;
    for ( int i=0; i<t; i++)
    {
        long long a, b;
        fin >> a >> b;
        while (b )
        { int r= a % b;
        a = b;
        b = r;
        }
            fout << a << endl;
    }
    return 0;
}