import java.util.Scanner;
 
public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num1 = scan.nextInt();
        int num2 = scan.nextInt();  
        if (num1 <= num2) {
            System.out.println("unsafe");
        }
        else {
            System.out.println("safe");
        }
        scan.close();
    }
} import java.util.Scanner; Scanner java.util public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num1 = scan.nextInt();
        int num2 = scan.nextInt();  
        if (num1 <= num2) {
            System.out.println("unsafe");
        }
        else {
            System.out.println("safe");
        }
        scan.close();
    }
} Main public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num1 = scan.nextInt();
        int num2 = scan.nextInt();  
        if (num1 <= num2) {
            System.out.println("unsafe");
        }
        else {
            System.out.println("safe");
        }
        scan.close();
    } main {
        Scanner scan = new Scanner(System.in);
        int num1 = scan.nextInt();
        int num2 = scan.nextInt();  
        if (num1 <= num2) {
            System.out.println("unsafe");
        }
        else {
            System.out.println("safe");
        }
        scan.close();
    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) int num1 = scan.nextInt(); num1 scan.nextInt() scan.nextInt scan int num2 = scan.nextInt(); num2 scan.nextInt() scan.nextInt scan if (num1 <= num2) {
            System.out.println("unsafe");
        }
        else {
            System.out.println("safe");
        } num1 <= num2 num1 num2 {
            System.out.println("unsafe");
        } System.out.println("unsafe") System.out.println System.out System System.out "unsafe" {
            System.out.println("safe");
        } System.out.println("safe") System.out.println System.out System System.out "safe" scan.close() scan.close scan String[] args args public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num1 = scan.nextInt();
        int num2 = scan.nextInt();  
        if (num1 <= num2) {
            System.out.println("unsafe");
        }
        else {
            System.out.println("safe");
        }
        scan.close();
    }
} public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num1 = scan.nextInt();
        int num2 = scan.nextInt();  
        if (num1 <= num2) {
            System.out.println("unsafe");
        }
        else {
            System.out.println("safe");
        }
        scan.close();
    }
} Main
import java.util.Scanner;
 
public class Main{
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num1 = scan.nextInt();
        int num2 = scan.nextInt();  
        if (num1 <= num2) {
            System.out.println("unsafe");
        }
        else {
            System.out.println("safe");
        }
        scan.close();
    }
}