#include<stdio.h>
#include<ctype.h>
int main(){
    int n;
    int arr[n];
    scanf("%d",&n);
    if(isdigit(n)){
        printf("Invalid input");
        return 0;
    }
    int head = 0;
    for(int i=0;i<n;i++){
        scanf("%d",&arr[i]);
        printf("%d",arr[i]);
    }
    }
}