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

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

