#include <iostream>
#include <fstream>
using namespace std;

ifstream fin("euclid2.in");
ofstream fout("euclid2.out");

int cmmdc(int a, int b){
    if(a == 0) return b;
    else if (b == 0) return a;
    else if(a > b) return cmmdc(b, a % b);
    else if(a < b) return cmmdc(a, b % a); 

    return 0;
}

int main(){
    int T;
    fin >> T;
    for(int i = 1; i <= T; i++){
        int x, y;
        fin >> x >> y;
        fout << cmmdc(x, y) << endl;
    }

    return 0;
}