%{
 
%}
%s SM SMBG 
%%
# BEGIN(SM);
## BEGIN(SMBG);
[0-9]+ {
 printf("\n It's a Digit ");
 } 
<SMBG>[A-Z]+ { printf("\n String contains upper case letters ");
 } 
<SM>. {
printf("\n Exiting from # start condition "); 
 BEGIN(INITIAL);
 } 
<SM,SMBG>[a-z]+ {
 printf("\n String contains lower case letters "); 
 } 
<SMBG>.+ {
printf("\n Exiting from ## start condition "); 
 } 
.+ {
 printf("\n No action to execute "); 
 } 
 
%%
void main()
{ 
yylex(); 
} 
int yywrap()
{ 
return 1;
} 
 

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MTIyIGhlbGxv

122 hello