score

all = input("Enter scores seperated by spaces from one line: ")
all = all.split(" ")
all_scores = []
best = 0
for s in all:
    all_scores.append(int(s))
    if int(s) > best:
        best=int(s)
for score in all_scores:
    if score >= best-10:
        print(f'Student {all_scores.index(score)} score is {score} and grade is A')
    elif score >= best-20:
        print(f'Student {all_scores.index(score)} score is {score} and grade is B')
    elif score >= best-30:
        print(f'Student {all_scores.index(score)} score is {score} and grade is C')
    elif score >= best-40:
        print(f'Student {all_scores.index(score)} score is {score} and grade is D')