Computer secondary python simple application problems (1)

There is a file PY202.py in the candidate's folder. This file is the code prompt framework for this topic, and the code can be modified at will. Please write code in this file to achieve the following functions
Use the keyboard to input information such as the name of the course that Xiao Ming studied and test scores. The information is separated by spaces, one line for each course, and a blank line to end the entry. Example
The format is as follows
Mathematics 90
Language 95
Yangyu 86
Physics 84
Biology 87
The screen outputs the course and grade with the highest score, the course and grade with the lowest score, and the average score (with 2 decimal places).
Note that the comma is an English comma, and the format is as follows
The highest score course is 95 for Chinese, the lowest score is 84 for physics, and the average score is 88. 40
Tip: It is recommended to use the python integrated development environment IDLE provided by this machine to write, debug and verify programs.

data = input()  # Course name Test score
d={}
while data:
    t=data.split()
    d[t[0]]=t[1]
    data = input()
ls=list(d.items())
ls.sort(key=lambda x:x[1],reverse=True)
s1,g1=ls[0]
s2,g2=ls[len(ls)-1]
a=0
for i in d.values():
    a=a+int(i)
a=a/len(ls)
print("The highest-scoring course is {} {}, the lowest-scoring course is {} {}, and the average score is {:.2f}".format(s1,g1,s2,g2,a))

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