#include<bits/stdc++.h>
using namespace std;
//gcd(a,b)=gcd(b,a%b)
/*
18 32
32 18
18 14
14 4
4 2
2 0
*/
int gcd(int a,int b)
{
	if(b==0) return a;
	return gcd(b,a%b);
}
int main()
{
	int t;
	cin>>t;
	while(t--)
	{
		int a,b;
		cin>>a>>b;
		cout<<gcd(a,b)<<endl;
	}
	return 0;
}