Understanding Data Types and Math: Temperature Conversion

a = input( ' input Celsius ' )
sum2 = int(a) * 9/5+32
 print ( ' Fahrenheit:{} ' .format(sum2))

a = input( ' Enter the temperature in Fahrenheit ' )
sum2 = 5*( int(a) -32)/9
 print ( ' Celsius:{} ' .format(sum2))