import java.util.Scanner;

/**
 * Main
 */
public class Main {

    public static void main(String[] args) {
        Scanner cin =  new Scanner(System.in);
        int a = cin.nextInt();
        int b = cin.nextInt();
        if(a > b) 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 cin =  new Scanner(System.in);
        int a = cin.nextInt();
        int b = cin.nextInt();
        if(a > b) System.out.println("safe");
        else System.out.println("unsafe"); 
    }
} Main public static void main(String[] args) {
        Scanner cin =  new Scanner(System.in);
        int a = cin.nextInt();
        int b = cin.nextInt();
        if(a > b) System.out.println("safe");
        else System.out.println("unsafe"); 
    } main {
        Scanner cin =  new Scanner(System.in);
        int a = cin.nextInt();
        int b = cin.nextInt();
        if(a > b) System.out.println("safe");
        else System.out.println("unsafe"); 
    } Scanner cin =  new Scanner(System.in); cin new Scanner(System.in) int a = cin.nextInt(); a cin.nextInt() cin.nextInt cin int b = cin.nextInt(); b cin.nextInt() cin.nextInt cin if(a > b) System.out.println("safe");
        else System.out.println("unsafe"); a > b a b System.out.println("safe") System.out.println System.out System System.out "safe" 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 cin =  new Scanner(System.in);
        int a = cin.nextInt();
        int b = cin.nextInt();
        if(a > b) System.out.println("safe");
        else System.out.println("unsafe"); 
    }
} public class Main {

    public static void main(String[] args) {
        Scanner cin =  new Scanner(System.in);
        int a = cin.nextInt();
        int b = cin.nextInt();
        if(a > b) System.out.println("safe");
        else System.out.println("unsafe"); 
    }
} Main
import java.util.Scanner;

/**
 * Main
 */
public class Main {

    public static void main(String[] args) {
        Scanner cin =  new Scanner(System.in);
        int a = cin.nextInt();
        int b = cin.nextInt();
        if(a > b) System.out.println("safe");
        else System.out.println("unsafe"); 
    }
}