#include <iostream>
#include <fstream>
using namespace std;
int main(){
ifstream f("bac.txt");
int pre;
f >> pre;
int nr = 1;
int curent;
while(!f.eof()){
f >> curent;
if(curent != pre){
if(nr) cout << pre << " " << nr << " ";
pre=curent;
nr = 1;
}
else nr++;
}
cout << pre << " " << nr << " ";
}