Need Help My Login Wont Work

admin = "admin"
Apass = "admin"
default = "default"
Dpass = "default"
shell.run("clear")
print("--Mine7 Login--")
print("Users:")
print("[Admin]")
print("[Default]")
status, input = pcall (read)
if input == admin then
    print "Password:"
    status, password = pcall (read,'*')
    if password == Apass then
	    print "Access Granted!"
	    sleep(2)
	    shell.run("cd","Admin")
	    shell.run("clear")
    else
	    print("Access Denied!")
	    sleep(2)
	    os.shutdown()
    end
elseif input == default then
    print "Password:"
    status, password = pcall (read,'*')
    if password == Dpass then
	    print "Access Granted!"
	    sleep(2)
	    shell.run("cd","Default")
	    shell.run("clear")
    else
	    print "Access Denied!"
	    sleep(2)
	    os.shutdown()
    end -- needed a end here
elseif input ~= admin and input ~= default then -- to stop people bypassing your script.
    print "Access Denied!"
    sleep(2)
    os.shutdown()
end