A school has following rules for grading system

[bishoyisantosh]

def get_grade(marks):
if marks < 25:
return "F"
elif 25 <= marks < 45:
return "E"
elif 45 <= marks < 50:
return "D"
elif 50 <= marks < 60:
return "C"
elif 60 <= marks < 80:
return "B"
else: # marks >= 80
return "A"
marks = int(input("Enter your marks: "))

if 0 <= marks <= 100:
print("Your Grade:", get_grade(marks))
else:
print("Invalid marks! Please enter a number between 0 and 100.")