#include <bits/stdc++.h>
using namespace std;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int cmmdc(int a, int b) {
  while (b != 0) {
    int r = a % b;
    a = b;
    b = r;
  }
  return a;
}

int main() {
    int n;
    fin >> n;
    int v[n];
    for (int i = 0; i < n; ++i) {
        int a, b;
        fin >> a >> b;
        fout << cmmdc(a, b) << "\n";
    }
    return 0;
}