Problem D

#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

#define optimize() ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define fraction() cout.unsetf(ios::floatfield); cout.precision(10); cout.setf(ios::fixed,ios::floatfield);
#define file() freopen("input.txt","r",stdin);freopen("output.txt","w",stdout);

int main() {
    optimize();
    int n;
    cin >> n;
    int a[n];
    for (int i = 0; i < n; ++i) cin >> a[i];
    int cnt = 1;
    bool started = 0;
    for (int i = 1; i < n; ++i) {
        if (a[i] == a[i - 1]) cnt++;
        else {
            if (started) cout << " ";
            started = 1;
            cout << cnt << " " << a[i - 1];
            cnt = 1;
        }
    }
    if (started) cout << " ";
    started = 1;
    cout << cnt << " " << a[n - 1] << endl;
    return 0;
}