currency = str(raw_input ("""what currency would you like to covert: GBP, EURO, USD OR YEN?
"""))
 
 
exchange = str(raw_input("""what currency would you like in exchange? : GBP, EURO, USD OR YEN?
                              """))
 
amount = int(input("""how much would you like to convert?
                      """))
 
 
 
valid_input = ('EUR','eur','GBP','gbp' ,'USD','usd','JPY','jpy')
 
while True:
 
    if currency in valid_input and exchange in valid_input:
 
        pass
 
    else:
 
        print("incorrect input, please restart program")
        break
 
 
decision = str(raw_input("""Please enter u for user input exchange rate or s for the preset exchange rate
    """))
 
 
if decision == "u" :
    user_rate = raw_input("Please enter the current exchange rate")
 
    exchange_value = int(amount) *  int(user_rate)
 
    print ("At the user found exchange rate you will receive",exchange_value,exchange)
 
 
 
elif decision == "s" :
 
 
    if currency  == "GBP" and exchange == "USD":
 
        exchange_value= int(amount) * 1.6048
 
        print ("At the preset exchange rate you will receive",exchange_value,exchange)
 
    if currency  == "GBP" and exchange == "EUR":
 
        exchange_value= int(amount) * 1.2399
 
        print ("At the preset exchange rate you will receive",exchange_value,exchange)
 
 
 
 

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