import re

book = dict()

def menu():
    print("(1) new entry")
    print("(2) find entry")
    print("(3) list entries")
    print("(4) quit")

def new_entry(book):

    name = input("Name? ")
    numb = input("Number? ")

    try:
        numb = int(numb)
    except ValueError as e:
        print("Invalid number")
    else:
        book[name] = numb

def find_entry(book):
    name = input("Name? ")

    if(not re.match(r'[a-zA-Z ]+$', name)):
        print("Invalid name")
        return

    if name in book:
        print(book[name])
    else:
        print("not found")

def list_entries(book):
    print("---")
    for n in iter(book):
        print(n, book[n])
    print("---")


request = 0
while(request != 4):
    menu()
    try:
        request = int(input("> "))
    except KeyboardInterrupt as e:
        print("Fehlerhafter Abbruch! Bitte Quit-Befehl nutzen")
    else:
        if(request == 1):
            new_entry(book)
        elif(request == 2):
            find_entry(book)
        elif(request == 3):
            list_entries(book)
        elif(request == 4):
            print("Bye")