diff --git a/labs/03/analyzer.l b/labs/03/analyzer.l
new file mode 100644
index 0000000..f7c8184
--- /dev/null
+++ b/labs/03/analyzer.l
@@ -0,0 +1,26 @@
+/* Created by Hedguhar Domínguez on 29/01/2024. */
+/* Lexical analyzer for the compiler */
+
+
+%{
+
+#include "analyzer.tab.h" /* Header file generated by Bison */
+
+%}
+
+
+%%
+
+"a"                 { return A; }
+"the"               { return THE; }
+"boy"               { return BOY; }
+"girl"              { return GIRL; }
+"flower"            { return FLOWER; }
+"touches"           { return TOUCHES; }
+"likes"             { return LIKES; }
+"sees"              { return SEES; }
+"with"              { return WITH; }
+[ \t\n]             { }
+.                   { return OTHER; }
+
+%%
diff --git a/labs/03/analyzer.y b/labs/03/analyzer.y
new file mode 100644
index 0000000..a44ab99
--- /dev/null
+++ b/labs/03/analyzer.y
@@ -0,0 +1,89 @@
+/* Created by Hedguhar Domínguez on 29/01/2024. */
+/* Syntactic analyzer for the compiler */
+
+
+%{
+
+#include <stdio.h>
+#include <stdlib.h>
+
+// Lex variables
+extern int yylex();
+
+// Function prototypes
+int yyerror(char const * s);
+
+%}
+
+
+/* Terminal symbols */
+%token A THE BOY GIRL FLOWER TOUCHES LIKES SEES WITH OTHER
+%start sentence
+
+
+%%
+
+// Grammar rules
+
+// ⟨SENTENCE⟩ → ⟨NOUN-PHRASE⟩⟨VERB-PHRASE⟩ 
+sentence: noun_phrase verb_phrase { printf("PASS\n"); }
+;
+
+// ⟨NOUN-PHRASE⟩ → ⟨CMPLX-NOUN⟩ | ⟨CMPLX-NOUN⟩⟨PREP-PHRASE⟩
+noun_phrase: cmplx_noun
+           | cmplx_noun prep_phrase
+;
+
+// ⟨VERB-PHRASE⟩ → ⟨CMPLX-VERB⟩ | ⟨CMPLX-VERB⟩⟨PREP-PHRASE⟩
+verb_phrase: cmplx_verb
+           | cmplx_verb prep_phrase
+;
+
+// ⟨PREP-PHRASE⟩ → ⟨PREP⟩⟨CMPLX-NOUN⟩
+prep_phrase: prep cmplx_noun
+;
+
+// ⟨CMPLX-NOUN⟩ → ⟨ARTICLE⟩⟨NOUN⟩
+cmplx_noun: article noun
+;
+
+// ⟨CMPLX-VERB⟩ → ⟨VERB⟩ | ⟨VERB⟩⟨NOUN-PHRASE⟩
+cmplx_verb: verb
+          | verb noun_phrase
+;
+
+// ⟨ARTICLE⟩ → a | the
+article: A
+       | THE
+;
+
+// ⟨NOUN⟩ → boy | girl | flower
+noun: BOY
+    | GIRL
+    | FLOWER
+;
+
+// ⟨VERB⟩ → touches | likes | sees
+verb: TOUCHES
+    | LIKES
+    | SEES
+;
+
+// ⟨PREP⟩ → with
+prep: WITH
+;
+
+%%
+
+
+// Error function
+int yyerror(char const * s)
+{
+    fprintf(stderr, "FAIL\n");
+}
+
+
+void main()
+{
+    yyparse();
+}