#include <iostream>
#include <fstream>
using namespace std;
int euclid(int a, int b){
    if(a == 0)
        return b;
    else
        return(a, b%a);
}

int main()
{
    ifstream fin("euclid2.in");
    ofstream ofs("euclid2.out");

    int n;
    fin >> n;
    int a,b;
    for(int i = 0; i < n; i++){
        fin >> a >> b;
        ofs << euclid(a,b) << endl;;
    }
    fin.close();
    ofs.close();
    return 0;
}