#include<bits/stdc++.h> using namespace std; int a[55]; int main() { int n,i; cin>>n; for(i=1;i<=n;++i) cin>>a[i]; int k; cin>>k; for(i=1;i<n;++i) { cout<<a[i]<<" "; if(a[i]!=a[i+1]-1) cout<<k<<" "; } cout<<a[n]; return 0; }