#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int cmmdc (int a, int b){
    int r;
    while (b){
        r = a % b;
        a = b;
        b = r;
    }
    return a;
}
int main()
{
    int n, a, b;
    fin >> n;
    for (int i =  1; i <= n; i++){
        fin >> a >> b;
        fout << cmmdc(a, b) << endl;
    }
}