#Develop an application that prompts the user to enter a username and a password.

#If both username and password match one of the username$-$password pairs below, display: 'Welcome $!\text{'}$

#Otherwise, display: 'Invalid username$/$password$!\text{'}$

#The program must not be case sensitive

#Valid usernames$-$passwords:

# jdoe abc$123$

# mdoe $456789$

# smoe xyz$789$

# dlee abcxyz