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#include <bits/stdc++.h>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int main() {
int t;
fin >> t;
while(t--) {
int a,b;
fin >> a >> b;
// while (a != b) {
// if (a > b)
// a -= b;
// else
// b -= a;
// }
while (b) {
int r = a % b;
a = b;
b = r;
}
fout << a << '\n';
}
return 0;
}