417
The National Security Agency warned Microsoft about a vulnerability in Windows after a hacker group began to leak hacking tools used by the agency online , the Washington Post reported late Tuesday .
 ( discover vulnerability: warned,  a vulnerability: vulnerability, Microsoft: vulnerable system owner, The National Security Agency: discoverer, Windows: vulnerable system) 
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:
 ( discover vulnerability: warned,  a vulnerability: vulnerability, Microsoft: vulnerable system owner, The National Security Agency: discoverer, Windows: vulnerable system) 