I'm using an if statement, which is supposed to break the loop. Can Someone help me? (Swift Playgrounds)

//the loop didn't break. Which is weird. I tried to fix it, but it didn't work. I tried the same code in python. Same thing happened.

let code = "QQQQQQQQ"
let characters = "QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm1234567890!@#$%^&*()-=+_"
var cracker = ""

for letter in characters {
    for letter2 in characters{
        for letter3 in characters {
            for letter4 in characters {
                for letter5 in characters {
                    for letter6 in characters {
                        for letter7 in characters {
                            for letter8 in characters {
                                cracker = "\(letter)\(letter2)\(letter3)\(letter4)\(letter5)\(letter6)\(letter7)\(letter8)"
                                print(cracker)
                                if cracker == code {
                                    break
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}