function main(input) {
  let s = input.trim();
  let table = {};
  for (let i = "a".charCodeAt(0); i <= "z".charCodeAt(0); i++) {
    let c = String.fromCharCode(i);
    table[c] = 0;
  }
  for (let i = 0; i < s.length; i++) {
    let c = s[i].toLowerCase();
    if (c in table) {
      table[c] += 1;
    } else {
      table[c] = 1;
    }
  }
  for (let i = "a".charCodeAt(0); i <= "z".charCodeAt(0); i++) {
    let c = String.fromCharCode(i);
    console.log(c + " : " + String(table[c]));
  }
}

main(require("fs").readFileSync("/dev/stdin", "utf8"));
