#include <stdio.h>

int T, A, B;

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

int main(void)
{
    FILE*fin=fopen("euclid2.in","r");
    FILE*fout=fopen("euclid2.out","w");

    fscanf(fin,"%d", &T);
    for (; T; --T)
    {
        fscanf(fin,"%d %d", &A, &B);
        fprintf(fout,"%d\n", gcd(A, B));
    }

    return 0;
}