Editorial

Use a for loop. Print all integers from $n$ to $0$ in descending order with the text " $se k$ " in a column.

Algorithm realization

Read the input data.

scanf("%d", &n);

Print the numbers from $n$ to $0$ in descending order with the text " $se k$ " in a column.

for (i = n; i >= 0; i--)
  printf("%d sek\n", i);

Java realization

import java.util.*;

class Main 
{
  public static void main(String[] args) 
  {
    Scanner con = new Scanner(System.in);
    int n = con.nextInt();
    for(int i = n; i >= 0; i--)
      System.out.println(i + " sek");
    con.close();
  }
}

Python realization

Read the input data.

n = int(input())

Print the numbers from $n$ to $0$ in descending order with the text " $se k$ " in a column.

for i in range(n, -1, -1):
  print(i, "sek")