#include<stdio.h>
void insertionsort(int a[],int n){
    for( int i=1;i<n;i++){
        int key = a[i];
        int j =i-1;
        while (j>=0&[j]>key){
            a[j+1]=a[j];
            j--;
            
        }
        a[j+1]=key;
    }
}
#include<stdio.h>
int main(){
    int n;
    if(scanf("%d",&n) !=1||n<0){
        printf("Invalid input");
    }
    int a[n];
    for(int i=0;i<n;++){
        if(scanf(%d,&a[i]) !=1){
            printf("invalid input");
            
        }
    }
    for(int i=0;i<n;I++){
        printf("%d",a[i]);
    }
}