diff --git a/main.go b/main.go
index 7923dc2..a169aab 100644
--- a/main.go
+++ b/main.go
@@ -22,9 +22,10 @@ func FindItemInSlice(slice []byte, val byte) bool {
 	return false
 }
 
-func initFlags() {
+func initFlags() passwgen.PasswGen {
 
-	var characters *string = flag.StringP("characters", "c", "aA1!", "Type of characters on the password")
+	// Create the flags of the program
+	var characters *string = flag.StringP("characters", "c", "1aA%", "Type of characters on the password")
 	var min *int = flag.IntP("min", "m", 8, "Minimum size of the password")
 	var max *int = flag.IntP("max", "M", 16, "Maximum size of the password")
 
@@ -40,22 +41,28 @@ func initFlags() {
 			pssgenType = pssgenType | passwgen.LowerLetter
 		} else if FindItemInSlice(passwgen.UpperLetterChars(), v) {
 			pssgenType = pssgenType | passwgen.UpperLetter
-		} else if FindItemInSlice(passwgen.SpecialLetterChars(), v) {
+		} else if FindItemInSlice(passwgen.SpecialChars(), v) {
 			pssgenType = pssgenType | passwgen.Special
 		}
 	}
+
+	if *min > *max {
+		*max = *min
+	}
+
 	passgen_instance := passwgen.PasswGen{
 		CharactersType: pssgenType,
 		MinSize:        *min,
 		MaxSize:        *max,
 	}
-	fmt.Println(passgen_instance)
-
-	Unused(characters, min, max, passgen_instance, pssgenType)
 
+	return passgen_instance
 }
 
 func main() {
 
-	initFlags()
+	passgen_instace := initFlags()
+
+	password := passgen_instace.Generate()
+	fmt.Printf("Generated password:\n%v\n", password)
 }
diff --git a/passwgen/passwgen.go b/passwgen/passwgen.go
index 5000c13..f31ad55 100644
--- a/passwgen/passwgen.go
+++ b/passwgen/passwgen.go
@@ -1,6 +1,10 @@
 package passwgen
 
-import "fmt"
+import (
+	"fmt"
+	"math/rand"
+	"time"
+)
 
 type PasswGenCharType int
 
@@ -39,7 +43,7 @@ func UpperLetterChars() []byte {
 		'Z'}
 }
 
-func SpecialLetterChars() []byte {
+func SpecialChars() []byte {
 	return []byte{
 		'!', '"', '#', '$', '%',
 		'&', '\'', '(', ')', '*',
@@ -56,6 +60,35 @@ type PasswGen struct {
 	MaxSize        int
 }
 
-func main() {
-	fmt.Printf("%v\n", SpecialLetterChars())
+func (psg PasswGen) Generate() string {
+
+	availableChars := []byte{}
+
+	if psg.CharactersType&Numeral != 0 {
+		availableChars = append(availableChars, NumeralChars()...)
+	}
+	if psg.CharactersType&UpperLetter != 0 {
+		availableChars = append(availableChars, LowerLetterChars()...)
+	}
+	if psg.CharactersType&LowerLetter != 0 {
+		availableChars = append(availableChars, UpperLetterChars()...)
+	}
+	if psg.CharactersType&Special != 0 {
+		availableChars = append(availableChars, SpecialChars()...)
+	}
+
+	fmt.Printf("Available characters: %c\n\n", availableChars)
+
+	rand.Seed(time.Now().UnixNano())
+
+	password_size := psg.MinSize + rand.Intn(psg.MaxSize-psg.MinSize+1)
+	fmt.Printf("Password size: %v\n\n", password_size)
+
+	password := make([]byte, password_size)
+
+	for i := range password {
+		password[i] = availableChars[rand.Intn(int(len(availableChars)))]
+	}
+
+	return string(password)
 }