import java.util.*;
import java.lang.*;
import java.io.*;

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
        
        for(int i=50;i>=1;i--){
        System.out.println(i);
        }
        int a=50;
        while(a>=1){
            System.out.println(a);
            a--;
        }
    }
}