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This is when computer systems are hacked by criminals who then demand a sum of money to avoid a major city having its power cut off .
 ( ransom: demand,  criminals: attacker, a major city: victim, computer systems are hacked: attack pattern, a sum of money: price, having its power cut off: attack pattern) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( ransom: demand,  criminals: attacker, a major city: victim, computer systems are hacked: attack pattern, a sum of money: price, having its power cut off: attack pattern) 