Here's an example Python program that asks for the number of checks written during the past month and computes and displays the bank fees for the month for Ally Baba bank:
```
# Ask for the month and number of checks written
month = input("Enter the month: ")
num_checks = int(input("Enter the number of checks written this month: "))
# Validate the input
if num_checks < 0:
print("Cannot enter a negative number")
else:
# Compute the bank fees
base_fee = 10.0 # base fee for the month
if num_checks < 20:
per_check_fee = 0.10 # fee per check for fewer than 20 checks
elif num_checks < 40:
per_check_fee = 0.08 # fee per check for 20-39 checks
elif num_checks < 60:
per_check_fee = 0.06 # fee per check for 40-59 checks
else:
per_check_fee = 0.04 # fee per check for 60 or more checks
total_fee = base_fee + (num_checks * per_check_fee)
# Display the bank fees for the month
print(f"\\Check Fees Summary\\Month of statement: {month}\\For writing {num_checks} checks, the bank fee is ${total_fee:.2f}")
```
In this program, we first ask the user to enter the month and the number of checks written using the `input()` function and convert the latter to an integer using the `int()` function. We then validate the input to ensure that the number of checks is not negative using an `if` statement. If it is not negative, we compute the bank fees using a base fee of 10 dollars and a fee per check that depends on the number of checks written. Finally, we display the check fees summary using the `print()` function and the f-string syntax to format the output with two decimal places.