Видно тебе)

Ты про чего?

You should only return the grade letter, you don't need to add the score and arrow.

Next time, if you are having problem with your solution, use the Question tag instead.

Can you fix that?
I have done code well but It gave result error

Check my code's result.

def get_grade(s1, s2, s3):
score = int(sum([s1, s2, s3]) / len([s1, s2, s3]))

if 90 <= score <= 100:
    return f'{score} -> A'
elif 80 <= score < 90:
    return f'{score} -> B'
elif 70 <= score < 80:
    return f'{score} -> C'
elif 60 <= score < 70:
    return f'{score} -> D'
else:
    return f'{score} -> F'