#include <bits/stdc++.h>

#define pb push_back
#define ll unsigned long long int

using namespace std;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int t;
int gcd(int a, int b)
{
    return b==0 ? a : gcd(b, a%b);
}
int main()
{

    fin >> t;

    while(t--)
    {
        int a,b;
        fin >> a >> b;
        fout << gcd(a,b) << '\n';
    }

	return 0;

}