The input is a conversation between an automated system and a user looking for suggestions for pubs, restaurants and coffee shops in Cambridge. In the dialogue, the user may provide some criteria for the type of place they want such as price range, cuisine, etc. Given such a dialogue, output the price range the user if looking for which can take one of four values: Cheap, Moderate, Expensive and Don't Care. Output cannot be any other value than the four values. Note that if the user asks for the prices of items provided at a pub, restaurant or coffee shop but doesn't mention the price range they are looking for then the correct classification will be Don't Care. If the user does not mention a particular price, the correct classification will be Don't Care.

Example Input: System: 'Thank you for calling the Cambridge Information system. Your call will be recorded for research purposes. You may ask for information about a place to eat, such as a restaurant, a pub, or a cafe. How may I help you?'
User: 'unintelligible sil'
System: 'What kind of venue are you looking for? For example, a cafe, or a restaurant.'
User: 'unintelligible sil'
System: 'What kind of venue are you looking for? For example, a cafe, a pub, or a restaurant.'
User: 'im looking for a expensive pub food restaurant'
System: 'What type of food would you like? For example, American, Indian, or Japanese.'
User: 'restaurant with pub food'
System: 'Revolution is an outstanding restaurant. It serves pub food. It's in the expensive price range.'
User: 'pub food'
System: 'Revolution, which serves pub food, is an outstanding restaurant. It's in the expensive price range.'
User: 'may i have the address and area'
System: 'Revolution is located on 3-7 Downing Street.'
User: 'area'
System: 'Revolution is an outstanding restaurant.'
User: 'sil'
System: 'Revolution is a great restaurant.'
User: 'what area is the restaurant in'
System: 'Revolution is in the central part of town.'
User: 'in what area'
System: 'Revolution is in the central part of town.'
User: 'thank you and good bye'

Example Output: Expensive

Example Input: System: 'Thank you for calling the Cambridge Information system. Your call will be recorded for research purposes. You may ask for information about a place to eat, such as a restaurant, a pub, or a cafe. How may I help you?'
User: 'can i have an expensive greek restaurant'
System: 'What kind of price range are you looking for? For example, cheap, expensive, or free.'
User: 'noise sil'
System: 'What kind of price range are you looking for? For example, cheap, expensive, or moderate.'
User: 'expensive'
System: 'The Varsity, which serves greek food, is a great restaurant. It's in the expensive price range.'
User: 'can i have the address'
System: 'The Varsity is located on 35 Saint Andrew's Street.'
User: 'can i have the phone number'
System: 'The phone number of the Varsity is 01223356060.'
User: 'may i have the post code'
System: 'The Varsity is in the area with the postcode CB2 3AR.'
User: 'thank you good bye'

Example Output: Expensive

Example Input: System: 'Thank you for calling the Cambridge Information system. Your call will be recorded for research purposes. You may ask for information about a place to eat, such as a restaurant, a pub, or a cafe. How may I help you?'
User: 'restaurant'
System: 'What kind of price range are you looking for? For example, cheap.'
User: 'expensive'
System: 'What type of food would you like? For example, Chinese, Fastfood, or Thai.'
User: 'thai'
System: 'What type of food would you like? For example, Mexican and Tex Mex, Continental, or Middleeastern.'
User: 'continental'
System: 'Are you looking for somewhere near a particular venue? For example, Cherry Hinton Water Play, Trinity College, or the Whipple Museum of the History of Science.'
User: 'addenbrookes'
System: 'What part of town do you have in mind? For example, something in the central, riverside, or Romsey area.'
User: 'addenbrookes area'
System: 'Alimentum, which is in the Addenbrooke's part of town, is a great restaurant. It serves continental and french food and it's in the expensive price range.'
User: 'address'
System: 'Alimentum is on 152-154 Hills Road.'
User: 'phone number'
System: 'The phone number of Alimentum is 01223413000.'
User: 'thank you goodbye'

Example Output:
Expensive