const input = require('fs').readFileSync('/dev/stdin', 'utf8');
const alphabets = 'abcdefghijklmnopqrstuvwxyz'.split('');
let num = [];
let tmp = input.toLowerCase();
let str = tmp.split('')
for (let i = 0; i < alphabets.length; i++) {
    let cnt = 0;
    for (let j = 0; j < str.length; j++) {
        if (str[j] === alphabets[i]) {
            cnt++;
        }
    }
    num.push(cnt);
}

for  (i = 0; i < alphabets.length; i++) {
  console.log(alphabets[i] + " : " + num[i]);
}


