#include <iostream>
#include <fstream>

using namespace std;

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

int euler(int a,int b)
{
    int c;
    while(b)
    {
        c=a%b;
        a=b;
        b=c;
    }
    return a;
}


int main()
{
    int t;
    fin>>t;
    for(int i=0;i<t;i++)
    {
        int a,b;
        fin>>a>>b;
        fout<<euler(a,b)<<"\n";
    }
    return 0;
}