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