student_names = {}

# data structure
# student_names = {
#     "john": {
#       "HW1": 15
#       "HW2": 20
#     },
#     "jane": {
#       "HW1": 10
#       "HW2": 15
#     }
# }

def get_student_name():
    while True:
        student_name = input("Enter student name: ").strip().lower()
        if student_name == "!break":
            return None
        elif student_name in student_names:
            return student_name
        else:
            return student_name
        
def update_data(student_name, hw, score):
    if student_name not in student_names:
        student_names[student_name] = {}
    
    if hw not in student_names[student_name]:
        student_names[student_name][hw] = score
    else:
        print("HW already exists.")
        
def display_data():
    for student in student_names:
        print(f"{student}:")
        for hw in student_names[student]:
            print(f"  {hw}: {student_names[student][hw]}")

def main():
    Run = True
    
    while Run:
        student_name = get_student_name()
        
        if student_name is None:
            Run = False
            print("Outputting data...")
            break
        
        hw = input("Enter homework name: ").strip().lower()
        
        score = int(input("Enter score: "))
        update_data(student_name, hw, score)
        
    display_data()
    
if __name__ == "__main__":
    main()