#include<cstdio>
int t,i,j,a,b,r;
FILE *f,*g;
int main(){
    f = fopen("euclid2.in","r");
    g = fopen("euclid2.out","w");
    fscanf(f,"%d",&t);
    while(t--){
        fscanf(f,"%d%d",&a,&b);
        r = a % b;
        while(r){
            a = b;
            b = r;
            r = a % b;
        }
        fprintf(g,"%d\n",b);
    }

    fclose(f);
    fclose(g);
    return 0;
}