#include <bits/stdc++.h>

using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int n,a,b;
int cmmdc(int a,int b){
    while(b){
    int r=a%b;
    a=b;
    b=r;
    }
    return a;
}
int main()
{
    fin>>n;
    while(n--){
        fin>>a>>b;
        fout<<cmmdc(a,b)<<"\n";
    }
}