#a
for i in range(0,10,2):
    print(i)
#b:
sum_par = 0
for i in range(0,10,2):
    sum_par += i
print(sum_par)
#c
sum_odd = 0
#for i in range(1,10,2):
for i in range(9,0,-2):
    sum_odd += i
    #sum_odd = sum_odd +i
print(sum_odd)