#include <iostream>
#include <fstream>
#include <iomanip>
#include <map>

using namespace std;

int main(int argc, char* argv[]) {

	char c;
	float total = 0.0;
	map<char, double> freq_count;
	
	// initialize our 26 characters to zero
	for (int i = 0; i < 26; i++) {
		freq_count[(char)(i + 97)] = 0.0;
	}

	// open our file
	ifstream file(argv[1], ios::in);
	
	while ( ! file.eof() ) {
	  
	  	// read in each character from the file
		file >> c;
		if ( (c >= 65) && (c <= 90) ) {
		
			// upper case letter
			freq_count[c + 32]++;
			total++;
		} 
		else if ( (c >= 97) && (c <= 122) ) {
		
			// lowercase letter
			freq_count[c]++;
			total++;
		}
	}
	file.close();
  
  	// calculate the frequency of each character and print the result
	for (map<char, double>::iterator im = freq_count.begin(); im != freq_count.end(); ++im) {
		
		cout << im->first << ": " << setiosflags(ios::fixed) << setprecision(2) << (im->second / total * 100.0) << std::endl;
		
	}
}