#include<stdio.h>
#include<stdlib.h>
int cmp(const void*a,const void*b){
    return (*(int*)a-*(int*)b);

}
int main(){
    int N, X;
    scanf("%d",&N);
    scanf("%d",&X);
}
if (N < 0 || X < 0){
    printf("Invalid input\n");
    return 0;
}
int arr[N + 1];
for (int i = 0; i< N; i++) scanf("%d",&arr[i]);
arr[N] = X;
qsort(arr,N+1,sizeof(int),cmp);
for(int i = 0; i<=N;i++)printf("%d"arr[i]);
printf("\n");
return 0;
}