import sys
F_or_C_or_Q = '' #if we run a comparison before this variable has a value, we throw an error. comment out this whole line to see.
F = ''
C = ''

while F_or_C_or_Q != 'exit': #every time it finishes the code block below, it checks.
    F_or_C_or_Q = raw_input('Choose Fahrenheit, Celsius or quit (f,c or q): ')
    print F_or_C_or_Q
#input and output
    if F_or_C_or_Q == 'Fahrenheit' or F_or_C_or_Q == 'f' or F_or_C_or_Q == 'F':
        F = raw_input('Please input the degrees: ')
        print 'running f'
        print F, ' is ', (int(F) - 32) * 5/9, ' in Celsius.'
        break

    elif F_or_C_or_Q == 'Celsius' or 'c' or 'C':
        C = raw_input('Please input the degrees: ')
        print 'running c'
        print C, ' is ', (int(C) * 9/5) + 32, ' in Fahrenheit.'
        break

    elif F_or_C_or_Q == 'Quit' or 'q' or 'Q':
        print 'Goodbye!'
        exit

    else:
        print 'Please choose f,c or q.'

if '__name__' == '__main__':
    main()