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#include <bits/stdc++.h>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
long long x,y;
int t;
long long gcd(long long a,long long b)
{
while (a>0 && b>0)
{
if (a>b) a=a%b;
else b=b%a;
}
if (a>0) return a;
else return b;
}
int main()
{
fin >> t ;
while (t--)
{
fin >> x >> y ;
fout<< gcd(x,y)<<"\n";
}
return 0;
}