#include <iostream>
#include <stdio.h>

using namespace std;

long a,b;
long T;
long i;

long cmmdc(long a, long b)
{
    int r;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int main()
{
    freopen("euclid2.in","r", stdin);
    freopen("euclid2.out", "w", stdout);

    scanf("%d", &T);
    for(i=1; i<=T; ++i)
    {
        scanf("%d %d", &a, &b);
        printf("%d\n", cmmdc(a,b));

    }




    return 0;
}