#include <fstream>
#include <cstdlib>

using namespace std;
typedef unsigned int uint;

inline uint gcd( uint x, uint y )
{
	/*if( !y )
		return x;
	return gcd( y, x%y );*/
	if( !x )
		return y;
	uint t;
	while( y )
	{
		t=x%y;
		x=y;
		y=t;
	}
	return x;
}
int main( void )
{
	uint T, x, y;
	ifstream in( "euclid2.in" );
	ofstream out( "euclid2.out" );
	
	for( in>>T; T; --T )
	{
		in>>x>>y;
		out<<gcd( x, y )<<'\n';
	}	
	return EXIT_SUCCESS;
}