#include <cstdio>

using namespace std;
int t,x,y;
int cmmdc(int x,int y)
{
    int r;
    while(y)
    {
        r=x%y;
        x=y;
        y=r;
    }
    return x;
}
int main()
{
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);
    scanf("%d\n",&t);
    while(t--)
    {
        scanf("%d %d\n",&x,&y);
        printf("%d\n",cmmdc(x,y));
    }
    return 0;
}