#include<stdio.h>
void readd(),solve();
int a,b,T,cmmdc(int mic,int mare);
int main()
{	
	readd();
	solve();
	return 0;
}
void readd()
{
	freopen("euclid2.in","r",stdin);
	freopen("euclid2.out","w",stdout);
	scanf("%d",&T);
}
void solve()
{
	for(;T;T--)
		scanf("%d%d",&a,&b);
	printf("%d\n",cmmdc(a,b));
}
int cmmdc(int mare,int mic)
{
	int rest;
	while(mic)
	{rest=mare%mic;mare=mic;mic=rest;}
	return mare;
}