The following is a Flex input files, which is a part of project printing all recognized tokens of a source program. Assume we compile the project successfully, and run it against different source programs. $(2$ points each. Total: $8$ points$)$ ALPHA DIGIT

INT

IDENTIFIER

$[$A$-$Za$-$z$]$

$[0-9]$

$(0-91+$

$($ALPHA$)((($ALPHA$)|($DIGIT$)|"")*)$

fle

one

m$-$ Hipt un

near the tap

$$

$""$

INT for $($IDENTIFIER$)$

loop

$-$

$\{$

$$

cout $<<$ "white space" $<<$ endi; $)$ cout $<<$ "INT" $<<$ endl; return INT; $\}$ cout $<<$ "key word for" $<<$ endl; return FOR; $\}$ cout $<<$ "identifier" $<$ endl; return ID; $)$ cout $$ "key word loop" $<$ endl; return LOOP; $\}$ cout $$ "dot" $$ endi; $)$ If the source program is for loop $($two spaces between for and loop$),$ what's the output when yylex is called the second time?