#include <iostream>
#include <fstream>
using namespace std;

int cmmdc(int a,int b)
{
    if(a==b && a>=0)
        return a;
    else
        if(a>b)
            return cmmdc(a-b,b);
        else
            return cmmdc(a,b-a);
}

int main()
{
    int n;
    long int a,b;
    ifstream in("euclid2.in");
    ofstream out("euclid2.out");
    in>>n;
    for(int i=1;i<=n;++i)
    {
        in>>a>>b;
        out<<cmmdc(a,b)<<"\n";
    }
    return 0;
}