"Example given before exercise"
#def main():
    #for i in range (1,21,2):
        #print(i, end=' ')
    #print()

"Exercise"
def main():
    for i in range (0,101,10):
        print(i, end=' ')
    print("\n")
    for i in range (20,0,-1):
        print(i, end= ' ')

main()

