#include <bits/stdc++.h>
using namespace std;
int n;
int a[29]={}; 
int  tmp={};
int mx;
int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>tmp;
		mx=max(tmp,mx);
		a[tmp]++;
	}
	for(int i=1;i<=mx;i++){
		if(a[i]!=0)cout<<i<<" "<<a[i]<<endl;
		
	}
}
//Runtime Error.
//Received signal 11: Segmentation fault with invalid memory reference.

大佬们救救我吧，所有点都RE了