MakeITorBreakIT | Python Fiddle

#This Makes no Sense

Do = ""

E = "Exit"
B = "Back"
C = "Construction"
E = "Emergency"
M = "Markets"
R = "Real Estate"
L = "Law Firms"
H = "Help"

while Do != E:
    print("--------------------------------")
    print("Here is the Main Menu")
    print("C - Construction")
    print("ER - Emergency")
    print("M - Markets")
    print("R - Real Estate")
    print("L - Law Firms")
    print("H - Help")
    print("E - Exit")
    print("--------------------------------")
    Do = input("What are you looking for?")
    if Do == C:
        while Do != E:
            print("Here is our construction menu")
            print("---")
            print("---")
            print("---")
            print("---")
            print("---")
            Do = input("What are you looking for in Construction?")
    if Do == E:
    	while Do != ER:
            print("Here is our Emergencies menu")
            print("---")
            print("---")
            print("---")
            print("---")
            print("---")
            Do = input("What are you looking for in Emergencies?")
    if Do == M:
        while Do != E:
            print("Here is our Markets menu")
            print("---")
            print("---")
            print("---")
            print("---")
            print("---")
            Do = input("What Markets are you looking for?")
    if Do == R:
        while Do != E:
            print("Here is our Real Estate menu")
            print("---")
            print("---")
            print("---")
            print("---")
            print("---")
            Do = input("What are you looking for in Real Estate?")
    if Do == L:
        while Do != E:
            print("Here is our Law Firms menu")
            print("---")
            print("---")
            print("---")
            print("---")
            print("---")
            Do = input("What are you looking for in Law Firms?")
    if Do == H:
        while Do != E:
            print("Here is our Help menu")
            print("---")
            print("---")
            print("---")
            print("---")
            print("---")
            Do = input("What do you wish to do now?")
    if Do == E:
        print("THank you for using my app")

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