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

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