correctusername = "cold"
correctpassword = "palmer"

userusername = input( "Username:" )
userpassword = input( "Password: ")

if userusername == correctusername : 

    if userpassword == correctpassword :
        print( "Welcome!" )

    else:
        print( "Sorry, but your password is incorrect" )

else:
     print( "Sorry, but your username is not recognised" )