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// https://infoarena.ro/problema/euclid2
#include<fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int T;
int a, b;
int main() {
fin >> T;
for(int i = 0; i < T; i++) {
fin >> a >> b;
while(a != b) {
if(a > b) {
a -= b;
} else {
b -= a;
}
}
fout << a << endl;
}
return 0;
}