#include <iostream>
#include <fstream>

using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int n, a, b;

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

int main()
{
    fin>>n;
    for(int i=1; i<=n; i++) {
        fin>>a>>b;
        fout<<cmmdc(a, b)<<'\n';
    }

    return 0;
}