s = 0
for i in range(2, 100, 2):
    s += i
print(s)
---------------
for i in range(100, 20, -3):
    if i % 2 !=0:
        print(i)
-----------------------
frase = "Buen dia UTEC Buen dia UTEC"

flag = True
for i in frase:
    if flag == True:
        print(i, end="")
    flag = not flag
print()

for i in range(0, len(frase), 2):
    print(frase[i], end="")
print()

print(frase[3:7:2])