student = {
    "name": "Jupiter",
    "age": 20,
    "course": "Computer Science",
    "marks": 85
}

print("Dictionary:", student)

print("Name:", student["name"])
print("Age:", student["age"])

student["grade"] = "A"
print("After adding grade:", student)

student["marks"] = 90
print("After updating marks:", student)

del student["age"]
print("After deleting age:", student)

print("keys: ",student.keys())
print("values: ",student.values())

if "name" in student:
    print("Key 'name' exists in dictionary")
