Coding solution

 score = input("Enter score: ")

scr = float(score)

if scr >= 0.9 :

    print('A')

elif scr >= 0.8 :

    print('B')

elif scr >= 0.7 :

    print('C')

elif scr >= 0.6 :

    print('D')

elif scr<0.6 or scr>=0.0 :

    print('F')

else :

    print('Error')

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