import std.stdio;
import std.algorithm;
import std.array;
import std.conv;
import std.string;
import std.uni;

void main()
{
    int[dchar] b;
    for (dchar c = 'a'; c <= 'z'; c++)
        b[c] = 0;
    while (!stdin.eof)
    {
        auto a = readln.strip;
        foreach (i; a)
        {
            if (i.isAlpha)
                b[i.toLower] += 1;
        }
    }
    for (dchar c = 'a'; c <= 'z'; c++)
        writeln(c, " : ", b[c]);
}

