#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int t,a,b;
int gcd(int a, int b) {
    int r=a%b;
    while(r) {
        a=b;
        b=r;
        r=a%b;
    }
    return b;
}
int main()
{
    fin>>t;
    for(int i=1;i<=t;i++) {
        fin>>a>>b;
        fout<<gcd(a,b)<<'\n';
    }
    return 0;
}