import java.util.Scanner;
public class Main
{
 	public static void main(String[] args)
    {
     	 Scanner sc = new Scanner(System.in);
      	String[] num = sc.nextLine().split(" ");
      	if(Integer.parseInt(num[0]) > Integer.parseInt(num[1]))
        {
         	System.out.println("safe"); 
        }else{
          	System.out.println("unsafe"); 
        }
    }
} import java.util.Scanner; Scanner java.util public class Main
{
 	public static void main(String[] args)
    {
     	 Scanner sc = new Scanner(System.in);
      	String[] num = sc.nextLine().split(" ");
      	if(Integer.parseInt(num[0]) > Integer.parseInt(num[1]))
        {
         	System.out.println("safe"); 
        }else{
          	System.out.println("unsafe"); 
        }
    }
} Main public static void main(String[] args)
    {
     	 Scanner sc = new Scanner(System.in);
      	String[] num = sc.nextLine().split(" ");
      	if(Integer.parseInt(num[0]) > Integer.parseInt(num[1]))
        {
         	System.out.println("safe"); 
        }else{
          	System.out.println("unsafe"); 
        }
    } main {
     	 Scanner sc = new Scanner(System.in);
      	String[] num = sc.nextLine().split(" ");
      	if(Integer.parseInt(num[0]) > Integer.parseInt(num[1]))
        {
         	System.out.println("safe"); 
        }else{
          	System.out.println("unsafe"); 
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String[] num = sc.nextLine().split(" "); num sc.nextLine().split(" ") sc.nextLine().split sc.nextLine() sc.nextLine sc " " if(Integer.parseInt(num[0]) > Integer.parseInt(num[1]))
        {
         	System.out.println("safe"); 
        }else{
          	System.out.println("unsafe"); 
        } Integer.parseInt(num[0]) > Integer.parseInt(num[1]) Integer.parseInt(num[0]) Integer.parseInt Integer num[0] num 0 Integer.parseInt(num[1]) Integer.parseInt Integer num[1] num 1 {
         	System.out.println("safe"); 
        } System.out.println("safe") System.out.println System.out System System.out "safe" {
          	System.out.println("unsafe"); 
        } System.out.println("unsafe") System.out.println System.out System System.out "unsafe" String[] args args public class Main
{
 	public static void main(String[] args)
    {
     	 Scanner sc = new Scanner(System.in);
      	String[] num = sc.nextLine().split(" ");
      	if(Integer.parseInt(num[0]) > Integer.parseInt(num[1]))
        {
         	System.out.println("safe"); 
        }else{
          	System.out.println("unsafe"); 
        }
    }
} public class Main
{
 	public static void main(String[] args)
    {
     	 Scanner sc = new Scanner(System.in);
      	String[] num = sc.nextLine().split(" ");
      	if(Integer.parseInt(num[0]) > Integer.parseInt(num[1]))
        {
         	System.out.println("safe"); 
        }else{
          	System.out.println("unsafe"); 
        }
    }
} Main
import java.util.Scanner;
public class Main
{
 	public static void main(String[] args)
    {
     	 Scanner sc = new Scanner(System.in);
      	String[] num = sc.nextLine().split(" ");
      	if(Integer.parseInt(num[0]) > Integer.parseInt(num[1]))
        {
         	System.out.println("safe"); 
        }else{
          	System.out.println("unsafe"); 
        }
    }
}