// #include <iostream>
#include <fstream>

using namespace std;

ifstream in("euclid2.in");
ofstream out("euclid2.out");

int cmmdc(int a, int b) {
	while (a != 0) {
		int r = b % a;
		b = a;
		a = r;
	}
	return b;
}

int main() {
	int t; in >> t;
	for (int i = 0; i < t; i++) {
		int a, b; in >> a >> b;
		out << cmmdc(a, b) << "\n";
	}
	return 0;
}