[Swift] How to replace multiple strings

var str = "ABCDEF"
var newStr: String {
    let dictionary = ["A": "1","B": "2","C": "3","D": "4","E": "5","F": "6"]
    return dictionary.reduce(str) { $0.replacingOccurrences(of: $1.key, with: $1.value) }
}
print(newStr)  // 123456

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