import std.ascii;
import std.algorithm;
import std.array;
import std.conv;
import std.math;
import std.range;
import std.stdio;
import std.string;
import std.typecons;

T read(T)() { return readln.chomp.to!T; }
T[] reads(T)() { return readln.split.to!(T[]); }
alias readint = read!int;
alias readints = reads!int;

void main() {
    int[char] m;
    string s;
    while ((s = readln.chomp).length > 0) {
        foreach (c; s.filter!isAlpha) {
            m[cast(char)c]++;
        }
    }

    foreach (c; lowercase) {
        writefln("%s : %s", c, m.get(c, 0));
    }
}

