#include <bits/stdc++.h>

using namespace std;
int n;
int a,b;
int gcd(int a,int b){
int r;
while(b){
    r=a%b;
    a=b;
    b=r;
}
return a;
}
int main()
{
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);
    scanf("%d",&n);
    for(int i=1;i<=n;i++){
        scanf("%d%d",&a,&b);
        printf("%d\n",gcd(a,b));
    }
}