#include <cstdio>
using namespace std;
int cmmdc(int a,int b)
{
    if(!b)
        return a;
    else
        return cmmdc(b,a%b);
}
int main()
{
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);
    int t,a,b;
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d %d",&a,&b);
        printf("%d\n",cmmdc(a,b));
    }
    return 0;
}