Initial 5 problems

# Problem 1
# ver a - concatenation
def problem_one_a():
    name = input("What is your name: ")
    print("Hello " + name) # Note the space character after 'Hello'

# ver b - multiple arguments
def problem_one_b():
    name = input("What is your name: ")
    print("Hello", name)  # Note the lack of space character after 'Hello'

# Problem 2
def problem_two():
    num_one = int(input("Enter a whole number: "))
    num_two = int(input("Enter another whole number: "))
    print(num_one + num_two)

# Problem 3
def problem_three():
    num = int(input("Enter a whole number in the range 1 - 10: "))
    if num > 10:
        print("Number was supposed to be between 1 - 10!")
    elif num >= 6:
        print("The number is within the range 6 - 10")
    else:
        print(("The number is within the range 1 - 5"))

# Problem 4
def problem_four():
    age = int(input("Enter your age: "))
    if age > 60:
        print("You are old!")
    elif age >= 40:
        print("You are middle aged.")
    elif age >= 20:
        print("You are young.")
    elif age >= 13:
        print("You are a teenager.")
    else:
        print("You are a child.")
    print()

# Problem 5
def problem_five():
    num_1 = int(input("How old are you: "))
    if num_1 < 16 or num_1 >= 65:
        print("Your addmission fee is £5")
    else:
        print("Your addmission fee is £10")

# Main program
go_again_choices = ["y", "yes", "yep", "mos def", "whay eye"]
go_again = "yes"

while go_again in go_again_choices:
    valid_choices = ["1a", "1b", "2", "3", "4", "5"]
    choice = input("Which program do you want to run (1a, 1b, 2, 3, 4, 5): ")
    print()

    while choice not in valid_choices:
        print("Not a valid choice!")
        choice = input("Please choose from - 1a, 1b, 2, 3, 4, 5: ")
    if choice == "1a":
        problem_one_a()
        print()
    elif choice == "1b":
        problem_one_b()
        print()
    elif choice == "2":
        problem_two()
        print()
    elif choice == "3":
        problem_three()
        print()
    elif choice == "4":
        problem_four()
    elif choice == "5":
        problem_five()
        print()
    go_again = input("Do you want to go again (y / n): ").lower()
    print()