#include <bits/stdc++.h>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

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

int main(){
    int n;
    fin >> n;
    while(n--){
        int a,b;
        fin >> a >> b;
        fout << cmmdc(a,b) << '\n';
    }

    return 0;
}