#include<stdio.h>
int main(){
    int size,ind,k,itr,temp;
    scanf("%d",&size);
    scanf("%d",&k);
    if(size<0 || k<size){
        printf("Invalid input");
        return 0;
    }
    int arr[size];
    for(ind=0;ind<size;scanf("%d&arr[ind++"));
    for(ind=k-1;ind>=0;ind--)
        printf("%d",arr[ind]);
    for(ind=k;ind<size;ind++)
        printf("%d",arr[ind]);
    return 0;
}