#include<bits/stdc++.h>
using namespace std; 
int n,m,ans=1,g,h,a[200010];
int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i];
	}
	sort(a+1,a+n+1);
	cout<<a[1]<<" ";
	for(int i=2;i<n;i++){
		if(a[i]!=a[i-1]){
			cout<<ans<<endl<<a[i]<<" ";
			ans=1;
		}
		else{
			ans++;
		} 
	}
	cout<<ans;
	return 0;
}