#include <iostream>
#include <fstream>
using namespace std;
int cmmdc(int a, int b)
{
    if(!b)
        return a;
    return cmmdc(b,a%b);
}
int main()
{
    ifstream fin("euclid2.in");
    ofstream fout("euclid2.out");
    int t;
    int long a,b;
    fin>>t;
    for(;t;--t)
    {
        fin>>a>>b;
        fout<<cmmdc(a,b)<<'\n';
    }
    return 0;
}