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#include <fstream>
using namespace std;
ifstream cin("euclid2.in");
ofstream cout("euclid2.out");
int t;
long long a,b;
long long euclid(long long a,long long b)
{
if(!b)
return a;
else
return euclid(b,a%b);
}
int main()
{
cin>>t;
for(int i=0;i<t;i++)
{
cin>>a>>b;
cout<<euclid(a,b)<<'\n';
}
return 0;
}