'''
przedmioty = ["lampa", "biurko", "lozko", "myszka", "laptop"]
#for each (przechodzenie po itemach listy)
for p in przedmioty:
  print(p)
print("===============================")
#for index
for i in range(len(przedmioty)):
  print(przedmioty[i])
'''
'''
ceny = [5, 12, 1, 6, 123, 167.6, 67, 21, 37, 42, 60, 90, 5, 21, 123, 56.7, 5.2, 12, 1.5, 6, 23, 67, 21, 37,]
suma = 0
for c in ceny:
  suma += c
print(suma)
'''
'''
todo = ["pranie", "wyprowadzanie psa", "praca domowa", "wyjecie z suszarki", "zmywarka"]
status = []
for z in todo:
  tak_nie = input(f"czy {z} zrobione ")
  status.append(tak_nie)
print(todo)
print(status)
'''

#koniec
for i in range(10):
  print(i)
print("===============================")
#poczatek, koniec
for i in range(11,30):
  print(i)
print("===============================")
#poczatek, koniec
for i in range(11,30, 3):
  print(i)
print("===============================")
for i in range(10):
  print(i)
print("===============================")
for i in range(2, 20, 2):
  print(i)
print("===============================")
for i in range(3, 30, 3):
  print(i)
print("===============================")
for i in range(1, 10, -1):
  print(i)
print("===============================")
for i in range(1, 15, 3):
  print(i)
print("===============================")
for i in range(0, 50, -10):
  print(i)