#include <bits/stdc++.h> using namespace std; int main() { int n,h[100]; float sum=0; cin>>n; for(int i=0;i<n;i++) { cin>>h[i]; sum+=h[i]; } sum/=n; printf("%.1f",sum); cout<<endl; for(int j=0;j<n;j++) { if(h[j]>sum) { cout<<j+1<<":"<<h[j]<<" "; } } return 0; }