#include <cstdio>

using namespace std;

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

int main()
{
  freopen("euclid2.in", "r" ,stdin);
  freopen("euclid2.out", "w", stdout);
  
  int N;
  scanf("%d", &N);
  for (int i = 0; i < N; ++i) {
    int a, b;
    scanf("%d%d", &a, &b);
    printf("%d\n", _gcd(a, b));
  }
  return 0;
}