#include<bits/stdc++.h>

using namespace std;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int main()
{
    int n,i,a,b;
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>a>>b;
        while(a!=b)
            if(a>b)
                a-=b;
            else
                b-=a;
        fout<<a<<"\n";
    }
    return 0;
}