def main():
    l = []
    asko = input("Do you want to perform a list operation? ").strip().lower()
    while True:
        if asko == "yes":
            ask = input("Do you want to test, peek, add, or remove? ").strip().lower()
            if ask == "test":
                if not l:
                    print("The list is not empty")
                else:
                    print("The list is empty")
    
            elif ask == "peek":
                print(l[0])

            elif ask == "add":
                askn = int(input("What number do you want to add? ").strip().lower())
                l.append(askn)

            elif ask == "remove":
                l.pop(0)

            print(l)
        elif asko == "no":
            break
        else:
            print("Please say 'yes' or 'no'.")