import java.math.BigInteger;
import java.util.Scanner;

public class Main {
    static BigInteger gcd(BigInteger a, BigInteger b){
        if(b.equals(BigInteger.ZERO)) return a;
        return gcd(b,a.mod(b));
    }
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int t=sc.nextInt();
        while(t-->0){
            BigInteger a=sc.nextBigInteger(), b=sc.nextBigInteger();
            System.out.println(gcd(a,b));
        }
        sc.close();
    }
}