for x1 in range(-1,10,2):
    print("aaa")
    print("bbb")


for x2 in range(10,1,-2):
    print("aaa222")
    print("bbb222")
#step>0 step<0

for x3 in range(1,10,1):
    print(x3)

s=0
for x4 in range(1,101,1):
    s=s+x4
print(s)

s1=0
for x5 in range(1,101,2):
    s1=s1+x5
print(s1)

s2=0
for x6 in range(2,101,2):
    s2=s2+x6
print(s2)

s1=0
s2=0
for xx in range(1,101,1):
    if xx%2==0:
        s2=s2+xx
    else:
        s1=s1+xx
print(s1,s2)