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

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

    BigInt ans = 0;
    foreach (i, e; S[0 .. $ - 2])
    {
        if (e != 'c')
            continue;

        BigInt wc = S[i .. $].count!`a=='w'`;
        ans += wc * (wc - 1) / 2;
    }
    ans.writeln;
}