#include<cstdio>
using namespace std;

int Euclid(int a, int b)
{
    if(!b) return a;
    return Euclid(b,a%b);
}

int main()
{
    int T, x, y, i;
    FILE *fin, *fout;
    fin = fopen("euclid2.in","r");
    fout = fopen("euclid2.out","w");
    fscanf(fin,"%d",&T);
    for(i=1; i<=T; i++)
    {
        fscanf(fin,"%d%d",&x,&y);
        fprintf(fout,"%d\n",Euclid(x,y));
    }
    fclose(fin);
    fclose(fout);
    return 0;
}