1845
If any students or teachers logged on to social media or opened their email inbox using certain computers at Carleton University in Canada 's capital city of Ottawa recently , their every keystroke was likely recorded by an unknown hacker .
 ( data breach: was likely recorded,  an unknown hacker: attacker, keystroke: compromised data, students: victim, teachers: victim, computers: victim, Carleton University: victim, Ottawa: place, Canada: place) 
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:
 ( data breach: was likely recorded,  an unknown hacker: attacker, keystroke: compromised data, students: victim, teachers: victim, computers: victim, Carleton University: victim, Ottawa: place, Canada: place) 