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#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int t;
void citire();
long long int euclid(long long int, long long int);
int main()
{
citire();
return 0;
}
void citire()
{
int i;
long long int a, b;
fin>>t;
for(i=1;i<=t;++i)
{
fin>>a>>b;
fout<<euclid(a, b)<<'\n';
}
}
long long int euclid(long long int a, long long int b)
{
if(!b) return a;
return euclid(b, a%b);
}