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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
const int TMax = 1e5;
int t, a, b;
int CMMDC(int a, int b){
while (a && b){
if (a > b)
a = a % b;
else
b = b % a;
}
return max(a, b);
}
int main(){
fin >> t;
for (int i = 1; i <= t; i++){
fin >> a >> b;
fout << CMMDC(a, b) << '\n';
}
return 0;
}