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

ifstream f ("euclid2.in");
ofstream g ("euclid2.out");
int n,i,a,b;

int cmmdc(int& m, int& n)
{
    if(n>=m) m+=n,n=m-n,m=m-n;
    int r=m%n;
    while(r!=0)
    {
        m=n;
        n=r;  
        r=m%n;     
    }
    return n;
}

int main()
{
    f>>n;
    cout<<n<<endl;
    for(i=0;i<n;i++) f>>a>>b,g<<cmmdc(a,b)<<endl;
    f.close();
    g.close();
    return 0;
}