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#include <bits/stdc++.h>
#pragma GCC optimize("03")
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
int GCD(int a, int b){
if(a == 0) return b;
return GCD(b%a, a);
}
int main(){
ios::sync_with_stdio(false);
int t, a, b;
fin >> t;
for(int i = 0; i < t; i++){
fin >> a >> b;
fout << GCD(a, b) << endl;
}
}