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The culprits have demanded the city of Atlanta pay them $ 51,000 in bitcoin to unlock the government 's encrypted systems .
 them: attacker; $ 51,000: price; in bitcoin: payment method; encrypted systems: victim; government: 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:
 them: attacker; $ 51,000: price; in bitcoin: payment method; encrypted systems: victim; government: victim