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

int readint() {
    return readln.chomp.to!int;
}

int[] readints() {
    return readln.split.map!(to!int).array;
}

void main() {
    auto s = readln.chomp;

    auto c = s.count!(e => cast(char) e == 'c');
    auto w = s.count!(e => e == 'w');
    writeln(min(max(0, c - 1), w));
}