STDMarks = {
    "Salwa Ahmed": 50,
    "Abdullah Mohamed": 80,
    "Sultan Ghanim": 90
}
print("Before changing items in the dictionary:\n")
print(STDMarks)

STDMarks['Salwa Ahmed'] = 85    # update current value of the key 'Salwa Ahmed'
STDMarks['Omar Majid'] = 74     # Add a new item to the dictionary
print(STDMarks)