#include <bits/stdc++.h>

using namespace std;
int cmmdc(int a, int b)
{
    if(b==0) return a;
    return cmmdc(b,a%b);
}
int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    int t,a,b;
    f>>t;
    while(t--)
    {
        f>>a>>b;
        g<<cmmdc(a,b)<<'\n';
    }
    return 0;
}