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diff --git a/challenge-145/mohammad-anwar/swift/ch-1.swift b/challenge-145/mohammad-anwar/swift/ch-1.swift
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+import Foundation
+
+/*
+
+Week 145:
+
+    https://theweeklychallenge.org/blog/perl-weekly-challenge-145
+
+Task #1: Dot Product
+
+    You are given 2 arrays of same size, @a and @b.
+
+    Write a script to implement Dot Product.
+
+*/
+
+enum ParamError: Error {
+    case missingListA
+    case missingListB
+    case invalidListA
+    case invalidListB
+    case mismatchList
+}
+
+do {
+    let paramCount:Int = Int(CommandLine.argc)
+
+    if paramCount <= 1 {
+        throw ParamError.missingListA
+    }
+    if paramCount <= 2 {
+        throw ParamError.missingListB
+    }
+
+    let a:String = CommandLine.arguments[1]
+    let b:String = CommandLine.arguments[2]
+    if isValidList(a) {
+        if isValidList(b) {
+            let list_a = a.components(separatedBy: ",")
+            let list_b = b.components(separatedBy: ",")
+
+            if list_a.count == list_b.count {
+                var dp:Int = 0
+                for i in 0...list_a.count-1 {
+                    let _a:Int = Int(list_a[i])!
+                    let _b:Int = Int(list_b[i])!
+
+                    dp += _a * _b
+                }
+
+            	print(dp)
+            }
+            else {
+            	throw ParamError.mismatchList
+            }
+        }
+        else {
+            throw ParamError.invalidListB
+        }
+    }
+    else {
+        throw ParamError.invalidListA
+    }
+}
+catch ParamError.missingListA {
+    print("Missing list A.")
+}
+catch ParamError.missingListB {
+    print("Missing list B.")
+}
+catch ParamError.invalidListA {
+    print("Invalid list A.")
+}
+catch ParamError.invalidListB {
+    print("Invalid list B.")
+}
+catch ParamError.mismatchList {
+    print("Mismatch list.")
+}
+catch let error {
+    print(error)
+}
+
+//
+//
+// Functions
+
+func isValidList(_ list:String) -> Bool {
+
+    let pattern = "^[\\-?\\d\\,?\\s?]+$"
+    let regex   = try! NSRegularExpression(pattern: pattern)
+    let range   = NSRange(location: 0, length: list.utf16.count)
+
+    if regex.firstMatch(in: list, options: [], range: range) != nil {
+        return true
+    }
+    else {
+        return false
+    }
+}