#include<stdio.h>
int main(){
    int n,i, newScore;
    scanf("%d",&n);
    if(n<=0){
        printf("Invalid input");
        return 0;
    }
    int scores[n];
    for (i=0;i<n;i++){
        scanf("%d",& scores[i]);
    }
    for(i=1;i<n;i++){
        if(scores[i] < scores[i-1]){
            printf("Invalid input");
            return 0;
        }
    }
    scanf("%d",&newScores);
    int inserted=0;
    for(i=0;i<n;i++){
        if(!inserted && newScore < score[i]){
            printf("%d",newScore);
            inserted=1;
        }
        printf("%d",scores[i]);
    }
    if(!inserted)
    printf("%d" , newScore);
    return 0;
}