#include <cstdio>
int a, b, t;
int cmmdc(int a, int b)
{
    if(!b) return a;
    return cmmdc(b, a%b);
}
void rezolva_problema()
{
    int i;
    scanf("%d", &t);
    for(i=1;i<=t;++i)
    {
        scanf("%d%d", &a, &b);
        printf("%d\n", cmmdc(a,b));
    }
}
int main()
{
    freopen("euclid2.in","r", stdin);
    freopen("euclid2.out", "w", stdout);
    rezolva_problema();
    return 0;
}