#include <iostream>
#include <map>
#include <algorithm>
#include <utility>

void print( const std::pair<char, int>& p )
{
  std::cout << p.first << ':' << p.second << std::endl;
}

int main()
{
  std::map<char, int> stat;
  char c;
  while( std::cin >> c )
  {
    stat[c]++;
  }
  std::for_each( stat.begin(), stat.end(), print );
}