# include <iostream>
# include <cstdio>
# include <algorithm>
# include <cstring>

using namespace std;

int A,B,T;

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

int main()
{
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);
    scanf("%d",&T);
    for(;T;--T)
    {
        scanf("%d%d",&A,&B);
        printf("%d\n",euclid(A,B));
    }
    return 0;
}