#include <stdio.h>

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

int main()
{
	int a,b,n,i;
	FILE *f,*g;	

	f=fopen("euclid2.in","r");
	g=fopen("euclid2.out","w");

	i=0;
	fscanf(f,"%i",&n);
	while (i<n)
	{
		i++;
		fscanf(f,"%i%i",&a,&b);
		fprintf(g,"%i\n",cmmdc(a,b));
	}

	fclose(f);
	fclose(g);
	return 0;
}