#include <fstream>

using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int cmmdc(int a,int b){
    int c;
    while(b!=0)
        {c=a%b;
        a=b;
        b=c;}
    return a;}

int main()
{
    int n,a,b;
    fin>>n;
    for(int i=1;i<=n;i++)
        {fin>>a>>b;
        fout<<cmmdc(a,b)<<'\n';}

    return 0;
}