# Program 69: Sum Odd
def main():
    n = int(input("Enter limit: "))

    total = 0

    for i in range(1, n+1):
        if i % 2 != 0:
            total += i

    print("Sum of odd:", total)

main()

Enter limit:  7


Sum of odd: 16

# Program 70: Max Digit
def main():
    num = int(input("Enter number: "))

    max_d = 0

    while num > 0:
        d = num % 10
        if d > max_d:
            max_d = d
        num = num // 10

    print("Max digit:", max_d)

main()

Enter number:  67


Max digit: 7

# Program 71: Count Spaces
def main():
    text = input("Enter text: ")

    count = 0

    for ch in text:
        if ch == " ":
            count += 1

    print("Spaces:", count)

main()

Enter text:  text


Spaces: 1