#include <bits/stdc++.h>

using namespace std;

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

int cmmdc(int a,int b)
{
    int r;
    while(b!=0)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    int n,x,y;
    fin>>n;
    for(int i=1;i<=n;i++)
    {
        fin>>x>>y;
        fout<<cmmdc(x,y)<<endl;
    }
}