#include <iostream>

using namespace std;

int main()
{
    int n, i, j,a[100], st, dr, mijl, mijl1, aparitii[100];
    cin>>n;
    for(i=0;i<n;i++)
        cin>>a[i];
    //perechile cu aceeasi paritate
    st=0;
    dr=n-1;
    nmijl=(st+dr)/2;
    mijl1=mijl;
    for(i=0; i<n/2; i++)
        if(a[mijl1--]%2==a[mijl++]%2)
        cout<<"{"<<a[mijl1]<<" , "<<a[mijl]<<"}";
    //nr de aparitii
    for(i=0;i<n-1;i++)
        for(j=1;j<n;j++)
            if(a[i]==a[j])
            {
            aparitii++;
            }
            cout<<a[i]<<" apare de "<<aparitii<<" ori";

    return 0;
}