Sir0zha

func switchUp(_ value: Int) -> String? {
        guard value > 0 && value < 10 else { return nil }
        switch value {
        case 1:
            return "Один"
        case 2:
            return "Два"
        default:
            return nil
        }
}

enum LocalizedValue: String {
        case 1 = "Один"
        case 2 = "Два"
        case 3 = "Три"
}
    
let string = LocalizedValue.1.rawValue

let frequents = "1[3333ddflsd111kfl1111sdkfls1111dfZ"

var D = [Character: Int]()

for elem in frequents
{
    if D.keys.contains(elem){
        D[elem] = D[elem]!+1;
    }
    else
    {
        D[elem] = 1
    }
}

var max = D.first
for elem in D{
    if elem.value > max!.value
    {
        max = elem
    }
}
print(max!)