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Services are being restored to the St. Louis Public Library computer system after a ransomware attack last Thursday impacted access to machines and data at all 17 branches .
 ( ransom: a ransomware attack,  last Thursday: time, access to machines and data: attack pattern, Louis Public Library computer system: victim) 
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: a ransomware attack,  last Thursday: time, access to machines and data: attack pattern, Louis Public Library computer system: victim) 