#include <algorithm>
#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
#include <cctype>
#include <map>

int main()
{
   std::ifstream in("finn.txt");

   if(!in)
   {
      std::cout << "Could not open file\n";
      return(1);
   }

   std::map<char, int> letterToCount;

   for(char c : "abcdefghijklmnopqrstuvwxyz")
      letterToCount[c] = 0;

   std::string line;
   int maxCount = 0;

   while(getline(in, line))
      for(char c : line)
         if(isalpha(c))
            maxCount = std::max(maxCount, ++letterToCount[(char)tolower(c)]);

   for(int i = maxCount; i > 0; i --)
      for(auto pair : letterToCount)
         if(pair.second == i)
            std::cout << std::setw(3) << i << ": " << pair.first << "\n";

   return(0);
}