#include<bits/stdc++.h>
using namespace std;
int n;
char name[105];
map<string,int> mp;
int main()
{
scanf("%d",&n);//因为n<10^6 用cin cout会超时
for(int i=0;i<n;++i){
scanf("%s",name);//慎用c_str
mp[name]++;
}
printf("%d\n",mp.size());
for(map<string,int>::iterator it=mp.begin();it!=mp.end();++it){
printf("%s %d\n",(it->first).c_str(),it->second);
}
return 0;
}