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

public class codeTest {

public static void main(String[] args){
Scanner in = new Scanner(System.in);

while(in.hasNext()){
BigInteger a = in.nextBigInteger();
BigInteger b = in.nextBigInteger();

System.out.printf("%d", a.gcd(b));
}

in.close();
}

}