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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
unsigned long long int a, b, t;
int impartire(int a, int b)
{
if(!b)
return a;
return impartire(b, a%b);
}
void Euclid()
{
fin >> t;
for(int i = 1; i <= t; i++)
{
fin >> a >> b;
fout << impartire(a, b) << '\n';
}
}
int main()
{
Euclid();
return 0;
}