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#include<iostream>
#include<fstream>
using namespace std;
ifstream fin("Euclid2.in");
ofstream fout("Euclid2.out");
long long Euclid2(long long x,long long y)
{ int r;
while(y!=0)
{
r=x%y;
x=y;
y=r;
}
return x;
}
int main()
{ long long n,a,b;
fin >> n;
for(int i=1; i<=n; ++i)
{
fin >> a >> b;
fout << Euclid2(a,b) << endl;
}
return 0;
}