#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int cmmdc(int a, int b){
    while(b){
        int r = a%b;
        a = b;
        b = r;
    }
    return a;
}
int main(){
    int t;
    fin >> t;
    for(int i = 1; i <= t; i++){
        int a, b;
        fin >> a >> b;
        fout << cmmdc(a, b) << endl;
    }
}