package com.example.codeforces

fun main(args: Array<String>) {
    val (n, k) = readLine()!!.split(' ').map(String::toInt)
    var result = n
    for (i in 0 until k) {
        result = if (result % 10 != 0) result - 1 else result / 10
    }
    println(result)
}