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// #include <iostream>
// #include <fstream>
// #include <algorithm>
// #include <stdio.h>
#include <bits/stdc++.h>
using namespace std;
int gcd(int a, int b) {
if (a > b)
return gcd (b, a);
else if (a == 0)
return b;
else return gcd(b%a, a);
}
int main() {
ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");
int T, a, b;
fin >> T;
for (int i = 0; i < T; i++) {
fin >> a >> b;
fout << gcd(a, b) << "\n";
}
return 0;
};