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#include <iostream>
#include <fstream>
using namespace std;
/*int suma(int nr)
{
if(nr==0)
return 0;
return suma(nr/10)+nr%10;
}
int Euclid (int a, int b)
{
while (b > 0)
{
int r = a % b;
a = b;
b = r;
}
return a;
}
*/
int Euclid (int a, int b)
{
if (b == 0) return a;
return Euclid(b, a % b);
}
int main()
{
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int a, b, n;
fin>>n;
for(int i=1; i<=n; i++)
{
fin>>a>>b;
fout<<Euclid(a, b)<<'\n';
}
return 0;
}