diff --git a/14_Day_Error_handling/14_day_starter/scripts/main.js b/14_Day_Error_handling/14_day_starter/scripts/main.js
index c6045c8..60c843c 100644
--- a/14_Day_Error_handling/14_day_starter/scripts/main.js
+++ b/14_Day_Error_handling/14_day_starter/scripts/main.js
@@ -1,2 +1,78 @@
 console.log(countries)
-alert('Open the console and check if the countries has been loaded')
\ No newline at end of file
+//alert('Open the console and check if the countries has been loaded')
+
+//Exercises 
+//Definir una fucion que ordene un arreglo de strings basandose el el ultimo caracter de cada elemento
+function sortStringByLastCaracter (array) {
+    if (!Array.isArray(array)){
+        throw TypeError ('Must be an array')
+    }
+
+    if (!array.every(e => typeof e === 'string'))
+       throw TypeError('All elements in array must be a string')
+
+       return array.sort((x, y) => x.charCodeAt(x.length - 1) - y.charCodeAt(y.length - 1))
+}
+
+let lenguajes = ['Albania', 'Pyton', 'JavaScript' , 'C#', 'PHP', 'Java', 'Html']
+
+try {
+    resultado = sortStringByLastCaracter(lenguajes)
+    console.log(resultado)
+} catch (error) {
+    console.log(`Error: ${error.message}`)
+}
+
+//definir una funcion para implementar un algoritmo merge-sort
+Array.prototype.mergeSort = function () {
+    if(this.length <= 1){
+        return this
+    }
+    let mitad = parseInt(this.length / 2);
+    let izq = this.slice(0, mitad).mergeSort()
+    let der = this.slice(mitad, this.length).mergeSort()
+    let merge = function(izq, der) {
+        let datos = [];
+
+        while(izq.length > 0 && der.length > 0){
+            datos.push(izq[0] <= der[0]? izq.shift() : der.shift())
+        }
+        return datos.concat(izq, der)
+    }
+
+    return merge(izq, der)
+} 
+let numeros = [11,7,19,3,2,5,29,23]
+console.log(numeros.mergeSort())
+
+// Definir una funcion para encontrar los elementos duplicados en un arreglo
+function findDuplicatesData (data) {
+    if(!Array.isArray(data)) {
+        throw TypeError('Argument must be an array');
+    }
+
+    if (!data.length){
+        return null
+    }
+
+    let duplicate = [];
+    for (let i = 0; i < data.length; ++i) {
+        
+        let item = data[i];
+
+        if(!duplicate.find(d => d == item) && data.slice(i + 1).find(d => d == item)){
+           duplicate.push(item)
+        }
+    }
+    return duplicate
+}
+
+
+
+let arr = [2,2,3,3,'hola', 'hola']
+
+try {
+    console.log(findDuplicatesData(arr))
+} catch (error) {
+    console.log(`Error: ${error.message}`)
+}