#include <stdio.h>
#include <stdlib.h>

int cmmdc(int a,int b)
{
    int r;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int main()
{
    FILE *f,*g;
    int i,a,b,n;
    f=fopen("euclid2.in","r");
    g=fopen("euclid2.out","w");
    fscanf(f,"%d",&n);
    for(i=0;i<n;i++)
    {
        fscanf(f,"%d %d",&a,&b);
        fprintf(g,"%d\n",cmmdc(a,b));
    }
    return 0;
}