#include <fstream>

using namespace std;

long gcd(long a, long b)
{
    if( a%b == 0 ) return b;
    else return gcd(b, a%b);
}

int main()
{
    ifstream inFile("euclid2.in");
    ofstream outFile("euclid2.out");

    int T, a, b;
    inFile >> T;

    while( T-- ){
        inFile >> a >> b;
        outFile << gcd(a, b) << "\n";
    }
}