##### LM #####
# Token names.

lex
	literal '+', '*'
	token number /[0-9]+/
	ignore ws / [ \t\n]+ /
end

def F
	[number '+']
|	[number]
|	[F '*' number]

def E
	[E '+' F]
|	[F]

def start 
	[E]

parse S: start[ stdin ]
R: start = match S ~ 9 + 9
print_xml( R )
print( '\n' )
##### IN #####
9 + 9
##### EXP #####
<start><E><E><F><number>9</number></F></E><_literal_0001>+</_literal_0001><F><number>9</number></F></E></start>