#include <iostream>
#include <cstdio>

using namespace std;

inline int euclid(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);

    int a, b, n;

    scanf("%d", &n);
    for(int i = 0; i < n; ++i){
        scanf("%d%d", &a,&b);
        printf("%d\n", euclid(a,b));
    }

    return 0;
}