//2023-01-19*****************************************************************************
/*import java.util.*;
public class Main{
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int i,j;
int n=sc.nextInt();
int [][]arr = new int [n][];
for(i=0;i<n;i++) {
arr[i]= new int[i+1];
arr[i][0] = sc.nextInt();
}
for(i=1;i<n;i++) {
for(j=1;j<i+1;j++) {
arr[i][j]=arr[i][j-1]-arr[i-1][j-1];
}
}
for(i=0;i<n;i++) {
for(j=0;j<i+1;j++) {
System.out.print(arr[i][j]+" ");
}
System.out.println();
}
}
}
함수 -> 메소드 method
반환타입 메소드이름 (매개변수){
명령들;
return ??;
}
import java.util.*;
public class Main{
public static int f(int a, int b) {
return a+b;
}
public static void main(String[] args) {
int a = f(50,100);
System.out.println(a);
}
}
*/
/*import java.util.*;
public class Main{
public static void f(int n) {
if(n==1)
System.out.println("hello");
else
System.out.println("world");
}
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
f(n);
}
}*/
/*import java.util.*;
public class Main{
public static char grade(int n) {
if(n>=90)return 'A';
else if(n>=80)return'B';
else if(n>=70)return'C';
else if(n>=60)return'D';
else return'F';
}
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
System.out.println(grade(n));
}
}*/
import java.util.*;
public class Main{
public static void main(String[] args) {
}
}