#include <iostream>
#include <fstream>

using namespace std;
int n;
int a,b;
int cmmdc(int a,int b)
{
    if(b==0)
        return a;
    return cmmdc(b,a%b);
}
void citire()
{
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
        {scanf("%d %d",&a,&b);
        printf("%d\n",cmmdc(a,b));}
}
int main()
{
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);
    citire();
    return 0;
}