firstDict = {1:"five", 2:"ten", 3:"fifteen", 4:"twenty"}
print(firstDict)
inputKeyToDelete = input("Please enter a key whose corresponding value you wish to delete: ")
if inputKeyToDelete in firstDict:
    firstDict.pop(inputKeyToDelete)
print(firstDict)

inputKeyToDelete = int(input("Please enter a key whose corresponding value you wish to delete: "))