$Code:$

#include<bits/stdc++.h>

using namespace std;
typedef unsigned long long ll;
const int maxn=2000005;
int n,sum;
ll key;
struct node{
	ll num;
	ll times=0;
}a[maxn];
bool cmp(node a,node b){
	return a.num>b.num;
}
int main(){
	
	ios::sync_with_stdio(false);
	cin.tie(0);cout.tie(0);
	
	cin>>n;sum=n;
	for(int i=1;i<=n;i++){
		cin>>key;
		a[key].num=key;
		a[key].times++; //cout<<a[key].times<<' '<<a[key].num<<' ';
		if(a[key].times>1) --sum;
	}
	for(int i=0;i<=n;i++){
		if(a[i].times>0) cout<<a[i].num<<' '<<a[i].times<<'\n';
	}
	
	return 0;
}