#include<stdio.h>
int main(){
    int n,gopi[101],akash[101];
    scanf("%d",&n);
    for(int i=0;i<a; i++){
        scanf("%d",&gopi[i]);
        loop:
        gopi[i]=akash[i];
        if(akash[i]==gopi[i]){
            goto loop;
        }
        else{
            printf("%d",akash[i]);
        }
    }
}