#include <bits/stdc++.h> using namespace std; int main() { string n; string a; cin>>a; cin>>n; int b = stoi(n); string min = "99999999999999999"; int l = a.size(); for(int i = 1;i <= b;i++) { string p = a; for(int j = 0;j < l;i++) { a.erase(j,1); if(a<=min) { min = a; break; } else { a = p; continue; } } p = a; l = a.size(); } cout<<a; return 0; }