#include<stdio.h>
using namespace std;

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

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