
import java.util.Scanner;

public class Main {

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

		int a = Integer.parseInt(sc.next());
		int b = Integer.parseInt(sc.next());
		
		if(a <= b) {
			System.out.println("unsafe");
		}
		else {
			System.out.println("safe");
		}
		
	}

} import java.util.Scanner; Scanner java.util public class Main {

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

		int a = Integer.parseInt(sc.next());
		int b = Integer.parseInt(sc.next());
		
		if(a <= b) {
			System.out.println("unsafe");
		}
		else {
			System.out.println("safe");
		}
		
	}

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

		int a = Integer.parseInt(sc.next());
		int b = Integer.parseInt(sc.next());
		
		if(a <= b) {
			System.out.println("unsafe");
		}
		else {
			System.out.println("safe");
		}
		
	} main {
		Scanner sc = new Scanner(System.in);

		int a = Integer.parseInt(sc.next());
		int b = Integer.parseInt(sc.next());
		
		if(a <= b) {
			System.out.println("unsafe");
		}
		else {
			System.out.println("safe");
		}
		
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = Integer.parseInt(sc.next()); a Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int b = Integer.parseInt(sc.next()); b Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc if(a <= b) {
			System.out.println("unsafe");
		}
		else {
			System.out.println("safe");
		} a <= b a b {
			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" String[] args args public class Main {

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

		int a = Integer.parseInt(sc.next());
		int b = Integer.parseInt(sc.next());
		
		if(a <= b) {
			System.out.println("unsafe");
		}
		else {
			System.out.println("safe");
		}
		
	}

} public class Main {

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

		int a = Integer.parseInt(sc.next());
		int b = Integer.parseInt(sc.next());
		
		if(a <= b) {
			System.out.println("unsafe");
		}
		else {
			System.out.println("safe");
		}
		
	}

} Main

import java.util.Scanner;

public class Main {

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

		int a = Integer.parseInt(sc.next());
		int b = Integer.parseInt(sc.next());
		
		if(a <= b) {
			System.out.println("unsafe");
		}
		else {
			System.out.println("safe");
		}
		
	}

}
