import std.stdio,
       std.conv,
       std.string,
       std.range,
       std.math,
       std.bigint,
       std.algorithm,
       core.bitop;

void main()
{
    auto S = readln.strip;

    long ans, wc;
    foreach_reverse (i, e; S)
    {
        if (e == 'w')
            wc++;

        if (e == 'c')
            ans += wc * (wc - 1) / 2;
    }
    ans.writeln;
}