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#include <bits/stdc++.h>
using namespace std;
ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");
void usain_bolt()
{
ios::sync_with_stdio(false);
fin.tie(0);
}
int gcd(int a, int b)
{
if(b == 0) return a;
return gcd(b, a % b);
}
int main()
{
int tt;
fin >> tt;
for(; tt; --tt) {
int a, b;
fin >> a >> b;
fout << gcd(a, b) << "\n";
}
return 0;
}