import std.stdio;
import std.conv, std.array, std.algorithm, std.string;
import std.math, std.random, std.range, std.datetime;
import std.bigint;

void main(){
	string s = readln.chomp;
	
	int x, y;
	foreach(c; s){
		if(c == 'c') x += 1;
		else if(c == 'w') y += 1;
		}
	
	int a = x - 1;
	int b = y;
	
	int ans;
	if(a < b) ans = a; else ans = b;
	
	ans.writeln;
	}