

import java.util.Arrays;
import java.util.Scanner;

public class Main {

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

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

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


import java.util.Arrays;
import java.util.Scanner;

public class Main {

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