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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
int n,a,b,x,maxim;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
f>>n;
for (int i=0;i<n;i++){
f>>a;
f>>b;
x=-1;
if (a>b){
maxim=b;
}else
maxim=a;
for (int i=2;i<=maxim;i++){
if (a%i==0 && b%i==0){
x=i;
}
}
if (x!=-1){
g<<x;
}else
g<<1;
g<<endl;
}
g.close();
f.close();
return 0;
}