fun main(){
    var food = readln()
    var newFood = ""
    for (i in food){
        if (i != '1' && i != '2' && i != '3' && i != '4' && i != '5' && i != '6' && i != '7' && i != '8' && i != '9' && i != '0')
            newFood += i
    }
    print(newFood)

}