#include<cstdio>

int cmmdc(int a, int b) {
  if(a % b == 0)
    return b;
  if(b % a == 0)
    return a;
  cmmdc(b, a % b);
}

int main() {

  FILE* in = fopen("euclid2.in", "r");
  FILE* out = fopen("euclid2.out", "w");
  int a, b;

  int n;
  fscanf(in, "%d", &n);
  for(int i = 0; i < n; ++i) {
    fscanf(in, "%d%d", &a, &b);
    fprintf(out, "%d\n", cmmdc(a, b));
  }
  //fprintf(stdout, "%d\n", c);

  return 0;
}