#include <cstring>

using namespace std;

char Letter[28] = {"0abcdefghijklmnopqrstuvwxyz"};

int main()

{

int s,t,w;

cin>>s>>t>>w;

string l;

cin>>l;

int i,j,k,key = 1;

int y =1;

for(y = 1;y<=5;y++)

{

key = 1;

for(i = w-1;i>=0&&key==1;i--)//l[i]

{

k = w-i;

for(j = s+i+1;j<=t-k+1&&key ==1 ;j++)//Letter[j]

{

if(l[i]==Letter[j-1])

{

for(;i<w;i++,j++)

l[i] = Letter[j];

key = 0;

cout<<l<<endl;

}

}

}

}

return 0;

}