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#include <bits/stdc++.h>
using namespace std;
long long cmmdc(long long a, long long b) {
while (b != 0) {
long long r = a % b;
a = b;
b = r;
}
return a;
}
int main() {
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int x;
fin >> x;
for (int i = 0; i < x; i++) {
long long a, b;
fin >> a >> b;
fout << cmmdc(a, b) << "\n";
}
return 0;
}