#include <fstream>

using namespace std;
int cmmdc(int a, int b)
{
    while(a!=b)
        if(a>b)
        a=a-b;
    else b=b-a;
    return a;
}
int main()
{
    ifstream in("euclid2.in");
    ofstream out("euclid2.out");
    int n, a, b;
    in>>n;
    while(in>>a>>b)
        out<<cmmdc(a,b)<<endl;
    return 0;
}