Highest Grade

Given a dictionary of grades with subjects (as keys) and grades (as values), you are asked to find the subject with the highest grade.
The program should print the name of the subject that has the highest grade. It’s guaranteed that there is only one such subject.
Input
Output
{'Physics': 8, 'Math': 9, 'History': 6.5}
Math
{'Biology': 7, 'Chemistry': 8.5, 'English': 7.5}
Chemistry
 

Constraints

Time limit: 2 seconds

Memory limit: 512 MB

Output limit: 1 MB

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