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#include <bits/stdc++.h>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
int t;
long long euclid(long long a,long long b)
{
if(a==0 || b==0)
return a+b;
else
{
long long r;
r=a%b;
while(r)
{
a=b;
b=r;
r=a%b;
}
return b;
}
}
int main()
{
f>>t;
for(int i=1;i<=t;i++)
{
long long x,y;
f>>x>>y;
g<<euclid(x,y)<<'\n';
}
return 0;
}