import java.util.Scanner;
public class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		while(scan.hasNext()){
			int x = scan.nextInt();
			int y = scan.nextInt();
			while(x != 0 && y != 0){
				int t = y;
				y = x;
				x = t % x;
			}
			System.out.println((x == 0)?y:x);
		}
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz