#include <iostream>
using namespace std;
int dp[100][3];//n文字目から前の一番近い'c','w','w'
int main(){
    string s;cin>>s;
    if(s[0] == 'c')dp[0][0] = 1;
    else dp[0][0] = -1;
    dp[0][1] = -1;
    dp[0][2] = -1;
    for(int i = 1; s.size() > i; i++){
        if(s[i] == 'c')dp[i][0] = 1;
        else if(dp[i-1][0] == -1)dp[i][0] = -1;
        else dp[i][0] = dp[i-1][0]+1;
        if(s[i] == 'w' && dp[i-1][0] != -1)dp[i][1] = dp[i-1][0]+1;
        else if(dp[i-1][1] == -1)dp[i][1] = -1;
        else dp[i][1] = dp[i-1][1]+1;
        if(s[i] == 'w' && dp[i-1][1] != -1)dp[i][2] = (dp[i-1][2] == -1 ? dp[i-1][1]+1 : min(dp[i-1][2],dp[i-1][1]+1));
        else if(dp[i-1][2] == -1)dp[i][2] = -1;
        else dp[i][2] = dp[i-1][2];
    }
    cout << dp[s.size()-1][2] << endl;
}