Help me in solving GSQ11 problem

My issue

how can solve this statement

My code

/* Write a query to do the following
- Set hourly_pay to 150 for HR employees
- Output the entire table
*/
update employee
set Hourly_pay = 150
where Department = Hr;

Learning course: 212CSE2305: Database Management Systems
Problem Link: https://www.codechef.com/learn/course/kl-dbms-cs-2024/KLDBMS2410/problems/GSQ11