#include <fstream>
#include <cmath>

using namespace std;

ifstream f("alibaba.in");
ofstream g("alibaba.out");

int n,k,x,p,nr,c1,c2,c3;

int main()
{
    f>>n>>k;
    f>>x;

    p = pow(10,n)/10;
    nr = 0;
    while(nr < k && p > 0)
    {
        c1 = x/p%10;
        p = p/10;
        if(p == 1) break;
        c2 = x/p%10;

        if(c1 > c2)
            {
                x = x/(p*10)*p + x%p;
                nr++;
            }
        if(c1 < c2)
            {
                x = x/(p*100)*p*10 + x%(p*10);
                nr++;
            }
        if(c1 == c2)
        {
            p = p/10;
            c3 = x/p%10;

            if(c2 >= c3)
            {
                x = x/(p*10)*p + x%p;
                nr++;
            }
            if(c2 < c3)
            {
                x = x/(p*100)*p*10 + x%(p*10);
                nr++;
            }
            p = p*10;
        }

    }
    if(nr < k)
    {
        p = pow(10,k-nr);
        if(x%p > x/p) x = x%p;
        else x = x/p;
    }
    g<<x;
    return 0;
}