added initial block rules

runner.c

@@ -81,7 +81,7 @@ int run(FILE *alpha) {
 	}
    	if(token == 1999){
                 printf("On line number %d and column number %d we have an invalid character:%s\n",line_number,column_number,yytext);
-                }
+                return -1;}
 	column_number += yyleng;
     }