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#include<iostream>#include<cstdio>#include<cmath>#include<iomanip>#include<cstdlib>#include<ctime>#include<algorithm>#include<cstring>#include<string>#include<sstream>#include<vector>#include<cassert>#include<memory>using namespace std;char a[10005], b[10005];int main(){int n, s, k;while (scanf("%d%d", &n, &s)==2){int temp = s, num = 0;memset(b, 0, sizeof(b));scanf("%s", a + 1);for (int i = 1; i <= n; i++){if (num>0 && a[i] != '0'&&b[1]>a[i] && s >= num){s = s - num;b[1] = a[i];num = 1;continue;}while (num>0 && s>0 && b[num]>a[i]){if (num == 1 && a[i] == '0')break;s = s - 1, num = num - 1;}num++;b[num] = a[i];}for (int i = 1; i <= n - temp; i++)cout<<b[i];cout << endl;}}