#include <map>
#include <iostream>

int main() {
    std::map<int, int> freqs;
    int num;
    while(std::cin >> num) {
        freqs[num]++; //this works because int values start at 0 inside of maps
    }
    for(auto it = freqs.begin(); it != freqs.end(); it++) {
        std::cout << it->first << " occurred " << it->second << " times." << std::endl;
    }
    return 0;
}