#include<bits/stdc++.h>
using namespace std;
int main(){
    int n[105],a;
    cin>>a;
    for (int i=0;i<=a-1;i++){
        cin>>n[i];
    }
    for (int i=0;i<=a-2;i++){
        if(a[i]-1<a[i]&&a[i]+1<a[i])
        cout<<a[i]<<endl;
    }
    return 0;
}
/**************************************************************
	Problem: 1153
	User: luyanchen
	Language: C++
	Result: Compile Error
****************************************************************/