var x = require('fs').readFileSync('/dev/stdin', 'utf8');
x = x.toLowerCase();
x = x.replace(/\s+/g, "");
var alphabet = "abcdefghijklmnopqrstuvwxyz";
alphabet = alphabet.split("");
alphabet.forEach((a, i) => {
  	var j = 0;
	for(var k=0; k<x.length;k++)
    {
      if(a === x[k])
      {j++;}
    }
  	console.log(a + " : " + j);
})
