356
NBC affiliate WXIA reported that the city received a ransom demand in bitcoin for $ 6,800 per unit or $ 51,000 to unlock the entire system .
 $ 6,800: price; in bitcoin: payment method; the city: victim; $ 51,000: price; system: victim
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: ransom 
  Option: victim, attacker, payment method, attack pattern, damage amount, tool, time, price, place 
Text: {0} 
Answer:
 $ 6,800: price; in bitcoin: payment method; the city: victim; $ 51,000: price; system: victim