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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int cmmdc(int a, int b) {
int r;
while(b) {
r = a%b;
a = b;
b = r;
}
return a;
}
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int t, a, b;
fin >> t;
for(int i=1; i<=t; i++) {
fin >> a >> b;
fout << cmmdc(a, b) << endl;
}
return 0;
}