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#include <bits/stdc++.h>
using namespace std;
#if 1
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
#define cout fout
#define cin fin
#endif
int gcd(int a,int b)
{
if(b==0)
return a;
else
return gcd(b,a%b);
}
int main()
{
int n;
cin >> n;
while(n--)
{
int a,b;
cin >> a >> b;
cout << gcd(a,b) << "\n";
}
return 0;
}