#include <fstream>

using namespace std;

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

int cmmdc(int x,int y){
    if(x<y){
        int aux=x;
        x=y;
        y=aux;
    }
    while(y>0){
        int aux=x%y;
        x=y;
        y=aux;
    }
    return x;
}

int main (){
    int n;
    fin>>n;
    for(int i=1;i<=n;i++){
        int x,y;
        fin>>x>>y;
        fout<<cmmdc(x,y)<<"\n";
    }
    return 0;
}