var input:[String] = readLine()!.map{String($0)}

var count = 0
for i in 0 ..< input.count {
    var index:Int = 0
    for j in i+1 ..< input.count {
        if Int(input[i])! < Int(input[j])! {
            index = j
        }
    }
    if index != 0 {
        let a = input[i]
        input[i] = input[index]
        input[index] = a
        break
    }
}
var output:String = ""
for c in input {
    output += c
}
print(output)