#include <bits/stdc++.h>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int t,a,b;
int cmmdc_iter(int,int);
int cmmdc_rec(int,int);
int main()
{
    f>>t;
    for(;t;t--)
    {
        f>>a>>b;
        g<<__gcd(a,b)<<'\n';
    }
    return 0;
}
int cmmdc_iter(int x,int y)
{
    int r;
    while(y!=0)
    {
        r=x%y;
        x=y;
        y=r;
    }
    return x;
}
int cmmdc_rec(int x,int y)
{
    if(y==0)return x;
    return cmmdc_rec(y,x%y);
}