/*
 * gcd.c
 *
 *  Created on: Jun 16, 2011
 *      Author: marius
 */

#include <stdio.h>

#include <stdio.h>

int a, b, T;

int gcd(int a, int b){
    if (!b) return a;
    return gcd(b, a % b);
}

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

    scanf ("%d", &T);
    for ( ; T; --T){
        scanf ("%d %d", &A, &B);
        printf ("%d\n", gcd (A, B));
    }        

    return 0;
}