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Spot the error

This Swift code contains one error – can you select the line that is incorrect?

Tip: You should mentally run the code from top to bottom, meaning that if line 3 says an integer should be returned and line 10 tries to return a string, line 10 is the wrong one.

func rateEfficiency(_ input: Int) -> String {
    var result: String = "SCORE \(input)\n"
    switch input {
    case 0...20:
        result += "Terrible"
    case 21...40:
        result += "Poor"
    case 41...60:
        result += "Average"
    case 61...80:
        result += "Good"
    default:
        result += "Excellent"
    }
    return result
}
print(rateEfficiency(input: 64))
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