#include <iostream>
using namespace std;
int t,n;
int x,y,z;
int main()
{
cin>>t>>n;
x=(t+n)-1;
y=n-1;
z=x-y;
int*liczby;
liczby=new int[x];
for(int i=y;i<x;i++)
{
int a;
cin>>a;
liczby[i]=a;
}
for(int i=z;i<x;i++)
{
int b;
if(i>=z+1) goto aaa;
b=0;
aaa:
liczby[b]=liczby[i];
b++;
}
for(int i=0;i<x-(n-1);i++)
{
cout<<liczby[i];
}
delete [] liczby;
return 0;
}
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