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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int n , a[100000],b[100000];
int Cmmdc(int a , int b)
{
int r;
while(b)
{
r=a%b;
a=b;
b=r;
}
return a;
}
void Citire()
{
int i;
fin>>n;
for(i=1;i<=n;i++)
fin>>a[i]>>b[i];
}
int main()
{
Citire();
int i;
for(i=1;i<=n;i++)
{fout<<Cmmdc(a[i],b[i]);
fout<<"\n";
}
return 0;
}